[wrynose][PATCH 0/3] libssh2: fix CVE-2026-66033, CVE-2026-66034, CVE-2026-66035

[wrynose][PATCH 0/3] libssh2: fix CVE-2026-66033, CVE-2026-66034, CVE-2026-66035

[Jaipaul Cheernam]

Fix three CVEs in libssh2 1.11.1 by backporting upstream fixes:

- CVE-2026-66033: potential OOB read/write with AES-GCM in ssh2_cipher_crypt()
- CVE-2026-66034: potential OOB read in libssh2_publickey_list_fetch()
- CVE-2026-66035: potential heap overflow on ETM decrypt

Backport adaptations:
- CVE-2026-66034: upstream uses ssh2_err() which is not available in
  1.11.1, replaced with _libssh2_error().
- CVE-2026-66035: upstream uses SSH2_SAFEFREE() (not in 1.11.1),
  replaced with LIBSSH2_FREE() + NULL reset. Also upstream renames
  decrypt() to transport_decrypt(), retained original name.

libssh2 ptest results (qemux86-64):
  before: PASSED: 1 FAILED: 0 SKIPPED: 0
  after:  PASSED: 1 FAILED: 0 SKIPPED: 0

Jaipaul Cheernam (3):
  libssh2: fix CVE-2026-66033
  libssh2: fix CVE-2026-66034
  libssh2: fix CVE-2026-66035

 .../libssh2/libssh2/CVE-2026-66033.patch      | 45 +++++++++++++++
 .../libssh2/libssh2/CVE-2026-66034.patch      | 40 +++++++++++++
 .../libssh2/libssh2/CVE-2026-66035.patch      | 56 +++++++++++++++++++
 .../recipes-support/libssh2/libssh2_1.11.1.bb |  3 +
 4 files changed, 144 insertions(+)
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66033.patch
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66034.patch
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66035.patch

[wrynose][PATCH 1/3] libssh2: fix CVE-2026-66033

[Jaipaul Cheernam]

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2026-66033
https://github.com/libssh2/libssh2/commit/a2ed82d40964bbc0d64cd717aa0a5a892117d2e6

libssh2 ptest results (qemux86-64):
  before: PASSED: 1 FAILED: 0 SKIPPED: 0
  after:  PASSED: 1 FAILED: 0 SKIPPED: 0

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
---
 .../libssh2/libssh2/CVE-2026-66033.patch      | 45 +++++++++++++++++++
 .../recipes-support/libssh2/libssh2_1.11.1.bb |  1 +
 2 files changed, 46 insertions(+)
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66033.patch

diff --git a/meta/recipes-support/libssh2/libssh2/CVE-2026-66033.patch b/meta/recipes-support/libssh2/libssh2/CVE-2026-66033.patch
new file mode 100644
index 0000000000..bb046a6eae
--- /dev/null
+++ b/meta/recipes-support/libssh2/libssh2/CVE-2026-66033.patch
@@ -0,0 +1,45 @@
+From d1b6996c3b31ce6b60d5a820ecc33880e61ef0ae Mon Sep 17 00:00:00 2001
+From: Viktor Szakats <commit@vsz.me>
+Date: Thu, 23 Jul 2026 10:32:04 +0200
+Subject: [PATCH] openssl: fix potential OOB read/write with AES-GCM in
+ `ssh2_cipher_crypt()`
+
+By applying two bounds checks to non-debug builds.
+
+Reported-by: Vladimir Eli Tokarev
+Fixes GHSA-c4f7-cvfc-33j7
+Follow-up to 3c953c05d67eb1ebcfd3316f279f12c4b1d600b4 #797
+
+Closes #2401
+
+CVE: CVE-2026-66033
+Upstream-Status: Backport [https://github.com/libssh2/libssh2/commit/a2ed82d40964bbc0d64cd717aa0a5a892117d2e6]
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+ src/openssl.c | 10 ++++++----
+ 1 file changed, 6 insertions(+), 4 deletions(-)
+
+diff --git a/src/openssl.c b/src/openssl.c
+index eba05031..28ae1cc0 100644
+--- a/src/openssl.c
++++ b/src/openssl.c
+@@ -1042,13 +1042,15 @@ _libssh2_cipher_crypt(_libssh2_cipher_ctx * ctx,
+     const int aadlen = (is_aesgcm && IS_FIRST(firstlast)) ? 4 : 0;
+     /* size of AT, if present */
+     const int authenticationtag = IS_LAST(firstlast) ? authlen : 0;
+-    /* length to encrypt */
+-    const int cryptlen = (unsigned int)blocksize - aadlen - authenticationtag;
++    unsigned int cryptlen; /* length to encrypt */
+ 
+     (void)algo;
+ 
+-    assert(blocksize <= sizeof(buf));
+-    assert(cryptlen >= 0);
++    if(blocksize > sizeof(buf) ||
++       blocksize < (size_t)(aadlen + authenticationtag))
++        return 1;
++
++    cryptlen = (unsigned int)blocksize - aadlen - authenticationtag;
+ 
+ #if LIBSSH2_AES_GCM
+     /* First block */
diff --git a/meta/recipes-support/libssh2/libssh2_1.11.1.bb b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
index 32e1ad6c16..7e320ed0f8 100644
--- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb
+++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
@@ -16,6 +16,7 @@ SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://CVE-2025-15661-1.patch \
            file://CVE-2025-15661-2.patch \
            file://CVE-2025-15661-3.patch \
+           file://CVE-2026-66033.patch \
            "
 
 SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7"

[wrynose][PATCH 2/3] libssh2: fix CVE-2026-66034

[Jaipaul Cheernam]

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2026-66034
https://github.com/libssh2/libssh2/commit/a13bb6c773f0d55ad1628cede57e99804cd898d9

libssh2 ptest results (qemux86-64):
  before: PASSED: 1 FAILED: 0 SKIPPED: 0
  after:  PASSED: 1 FAILED: 0 SKIPPED: 0

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
---
 .../libssh2/libssh2/CVE-2026-66034.patch      | 40 +++++++++++++++++++
 .../recipes-support/libssh2/libssh2_1.11.1.bb |  1 +
 2 files changed, 41 insertions(+)
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66034.patch

diff --git a/meta/recipes-support/libssh2/libssh2/CVE-2026-66034.patch b/meta/recipes-support/libssh2/libssh2/CVE-2026-66034.patch
new file mode 100644
index 0000000000..906356baf2
--- /dev/null
+++ b/meta/recipes-support/libssh2/libssh2/CVE-2026-66034.patch
@@ -0,0 +1,40 @@
+From 16720054e0b3f02e36f31dd04add534d73d4a18d Mon Sep 17 00:00:00 2001
+From: Viktor Szakats <commit@vsz.me>
+Date: Sat, 4 Jul 2026 11:19:49 +0200
+Subject: [PATCH] publickey: fix potential OOB read in
+ `libssh2_publickey_list_fetch()`
+
+Reported-by: Vladimir Eli Tokarev
+Fixes GHSA-w6g9-cpfp-22gc
+
+Closes #2202
+
+Backport adaptations:
+- The upstream fix uses ssh2_err() which is not available in libssh2
+  1.11.1. Replace with the equivalent _libssh2_error() call.
+
+CVE: CVE-2026-66034
+Upstream-Status: Backport [https://github.com/libssh2/libssh2/commit/a13bb6c773f0d55ad1628cede57e99804cd898d9]
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+ src/publickey.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/src/publickey.c b/src/publickey.c
+index 9c9fa618..f3776d2d 100644
+--- a/src/publickey.c
++++ b/src/publickey.c
+@@ -988,6 +988,13 @@ libssh2_publickey_list_fetch(LIBSSH2_PUBLICKEY * pkey, unsigned long *num_keys,
+                 }
+ 
+                 if(comment_len) {
++                    if(pkey->listFetch_s + comment_len >
++                       pkey->listFetch_data + pkey->listFetch_data_len) {
++                        _libssh2_error(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
++                                       "ListFetch data too short");
++                        goto err_exit;
++                    }
++
+                     list[keys].num_attrs = 1;
+                     list[keys].attrs =
+                         LIBSSH2_ALLOC(session,
diff --git a/meta/recipes-support/libssh2/libssh2_1.11.1.bb b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
index 7e320ed0f8..54022aa879 100644
--- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb
+++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
@@ -17,6 +17,7 @@ SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://CVE-2025-15661-2.patch \
            file://CVE-2025-15661-3.patch \
            file://CVE-2026-66033.patch \
+           file://CVE-2026-66034.patch \
            "
 
 SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7"

[wrynose][PATCH 3/3] libssh2: fix CVE-2026-66035

[Jaipaul Cheernam]

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2026-66035
https://github.com/libssh2/libssh2/commit/42e33d81577ed4b95d4b4f6f845e5ee8efe5eeb4

libssh2 ptest results (qemux86-64):
  before: PASSED: 1 FAILED: 0 SKIPPED: 0
  after:  PASSED: 1 FAILED: 0 SKIPPED: 0

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
---
 .../libssh2/libssh2/CVE-2026-66035.patch      | 56 +++++++++++++++++++
 .../recipes-support/libssh2/libssh2_1.11.1.bb |  1 +
 2 files changed, 57 insertions(+)
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66035.patch

diff --git a/meta/recipes-support/libssh2/libssh2/CVE-2026-66035.patch b/meta/recipes-support/libssh2/libssh2/CVE-2026-66035.patch
new file mode 100644
index 0000000000..7c15f92fb6
--- /dev/null
+++ b/meta/recipes-support/libssh2/libssh2/CVE-2026-66035.patch
@@ -0,0 +1,56 @@
+From 6671019836476649792eea12868a370133be1abe Mon Sep 17 00:00:00 2001
+From: Viktor Szakats <commit@vsz.me>
+Date: Fri, 3 Jul 2026 18:22:55 +0200
+Subject: [PATCH] transport: fix potential heap overflow on ETM decrypt
+
+Reported-by: Vladimir Eli Tokarev
+Fixes GHSA-6c79-444r-wx26
+
+Closes #2198
+
+Backport adaptations:
+- The upstream fix uses SSH2_SAFEFREE() to safely release allocated
+  memory and reset the pointer. Since SSH2_SAFEFREE() is not available
+  in libssh2 1.11.1, replace its usage with the equivalent NULL check,
+  LIBSSH2_FREE(), and pointer reset sequence.
+- The upstream fix renames decrypt() to transport_decrypt(). Since this
+  rename is not present in libssh2 1.11.1, retain the original
+  decrypt() function name.
+
+CVE: CVE-2026-66035
+Upstream-Status: Backport [https://github.com/libssh2/libssh2/commit/42e33d81577ed4b95d4b4f6f845e5ee8efe5eeb4]
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+ src/transport.c | 12 +++++++++++-
+ 1 file changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/src/transport.c b/src/transport.c
+index d147505b..9f386e75 100644
+--- a/src/transport.c
++++ b/src/transport.c
+@@ -242,6 +242,17 @@ fullpacket(LIBSSH2_SESSION * session, int encrypted /* 1 or 0 */ )
+                 unsigned char *decrypt_buffer;
+                 int blocksize = session->remote.crypt->blocksize;
+ 
++                if(p->total_num < mac_len + 4 + (size_t)blocksize) {
++                    if(p->payload) {
++                        LIBSSH2_FREE(session, p->payload);
++                        p->payload = NULL;
++                    }
++                    return LIBSSH2_ERROR_DECRYPT;
++                }
++                decrypt_size = (ssize_t)(p->total_num - mac_len - 4);
++
++                first_block[0] = 0;
++
+                 rc = decrypt(session, p->payload + 4,
+                              first_block, blocksize, FIRST_BLOCK);
+                 if(rc) {
+@@ -249,7 +260,6 @@ fullpacket(LIBSSH2_SESSION * session, int encrypted /* 1 or 0 */ )
+                 }
+ 
+                 /* we need buffer for decrypt */
+-                decrypt_size = p->total_num - mac_len - 4;
+                 decrypt_buffer = LIBSSH2_ALLOC(session, decrypt_size);
+                 if(!decrypt_buffer) {
+                     return LIBSSH2_ERROR_ALLOC;
diff --git a/meta/recipes-support/libssh2/libssh2_1.11.1.bb b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
index 54022aa879..dad363cac5 100644
--- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb
+++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
@@ -18,6 +18,7 @@ SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://CVE-2025-15661-3.patch \
            file://CVE-2026-66033.patch \
            file://CVE-2026-66034.patch \
+           file://CVE-2026-66035.patch \
            "
 
 SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7"

[wrynose][PATCH v2 0/4] libssh2: fix CVE-2026-66032, CVE-2026-66033, CVE-2026-66034, CVE-2026-66035

[Jaipaul Cheernam]

Fix four CVEs in libssh2 1.11.1 by backporting upstream fixes:

- CVE-2026-66032: dangling pointer in sftp_open after free
- CVE-2026-66033: potential OOB read/write with AES-GCM in ssh2_cipher_crypt()
- CVE-2026-66034: potential OOB read in libssh2_publickey_list_fetch()
- CVE-2026-66035: potential heap overflow on ETM decrypt

Backport adaptations:
- CVE-2026-66032: upstream uses SSH2_FREE() renamed from LIBSSH2_FREE()
  in newer libssh2. Context adjusted for 1.11.1.
- CVE-2026-66034: upstream uses ssh2_err() which is not available in
  1.11.1, replaced with _libssh2_error().
- CVE-2026-66035: upstream uses SSH2_SAFEFREE() (not in 1.11.1),
  replaced with LIBSSH2_FREE() + NULL reset. Also upstream renames
  decrypt() to transport_decrypt(), retained original name.

Changes since v1:
- Added CVE-2026-66032 fix

libssh2 ptest results (qemux86-64):
  before: PASSED: 1 FAILED: 0 SKIPPED: 0
  after:  PASSED: 1 FAILED: 0 SKIPPED: 0

Jaipaul Cheernam (4):
  libssh2: fix CVE-2026-66032
  libssh2: fix CVE-2026-66033
  libssh2: fix CVE-2026-66034
  libssh2: fix CVE-2026-66035

 .../libssh2/libssh2/CVE-2026-66032.patch      | 36 ++++++++++++
 .../libssh2/libssh2/CVE-2026-66033.patch      | 45 +++++++++++++++
 .../libssh2/libssh2/CVE-2026-66034.patch      | 40 +++++++++++++
 .../libssh2/libssh2/CVE-2026-66035.patch      | 56 +++++++++++++++++++
 .../recipes-support/libssh2/libssh2_1.11.1.bb |  4 ++
 5 files changed, 181 insertions(+)
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66032.patch
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66033.patch
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66034.patch
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66035.patch

[wrynose][PATCH v2 1/4] libssh2: fix CVE-2026-66032

[Jaipaul Cheernam]

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2026-66032
https://github.com/libssh2/libssh2/commit/5e4776146552d898b9c0e1b313cd093fa8dc92d0

libssh2 ptest results (qemux86-64):
  before: PASSED: 1 FAILED: 0 SKIPPED: 0
  after:  PASSED: 1 FAILED: 0 SKIPPED: 0

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
---
 .../libssh2/libssh2/CVE-2026-66032.patch      | 36 +++++++++++++++++++
 .../recipes-support/libssh2/libssh2_1.11.1.bb |  1 +
 2 files changed, 37 insertions(+)
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66032.patch

diff --git a/meta/recipes-support/libssh2/libssh2/CVE-2026-66032.patch b/meta/recipes-support/libssh2/libssh2/CVE-2026-66032.patch
new file mode 100644
index 0000000000..15a5266485
--- /dev/null
+++ b/meta/recipes-support/libssh2/libssh2/CVE-2026-66032.patch
@@ -0,0 +1,36 @@
+From 352341aaebcf91ab16e7fcff158fef4a3b8c32f6 Mon Sep 17 00:00:00 2001
+From: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+Date: Tue, 4 Aug 2026 12:32:31 +0000
+Subject: [PATCH] Prevent dangling pointer by nullifying data (#2180)
+
+Set data to NULL after freeing it to avoid dangling pointer. fixes
+GHSA-px3w-7g75-hg7w.
+
+Credit: VladimirEliTokarev
+
+CVE: CVE-2026-66032
+Upstream-Status: Backport [https://github.com/libssh2/libssh2/commit/5e4776146552d898b9c0e1b313cd093fa8dc92d0]
+
+Backport adaptations:
+- The upstream fix uses SSH2_FREE() which was renamed from
+  LIBSSH2_FREE() in newer libssh2. Context adjusted to match
+  the 1.11.1 codebase (different line numbers and surrounding
+  function/macro names).
+
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+ src/sftp.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/sftp.c b/src/sftp.c
+index 6ede3111..793f267c 100644
+--- a/src/sftp.c
++++ b/src/sftp.c
+@@ -1279,6 +1279,7 @@ sftp_open(LIBSSH2_SFTP *sftp, const char *filename,
+                                "got HANDLE FXOK"));
+ 
+                 LIBSSH2_FREE(session, data);
++                data = NULL;
+ 
+                 /* silly situation, but check for a HANDLE */
+                 rc = sftp_packet_require(sftp, SSH_FXP_HANDLE,
diff --git a/meta/recipes-support/libssh2/libssh2_1.11.1.bb b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
index 32e1ad6c16..bd7d1f7b1d 100644
--- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb
+++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
@@ -16,6 +16,7 @@ SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://CVE-2025-15661-1.patch \
            file://CVE-2025-15661-2.patch \
            file://CVE-2025-15661-3.patch \
+           file://CVE-2026-66032.patch \
            "
 
 SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7"

[wrynose][PATCH v2 2/4] libssh2: fix CVE-2026-66033

[Jaipaul Cheernam]

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2026-66033
https://github.com/libssh2/libssh2/commit/a2ed82d40964bbc0d64cd717aa0a5a892117d2e6

libssh2 ptest results (qemux86-64):
  before: PASSED: 1 FAILED: 0 SKIPPED: 0
  after:  PASSED: 1 FAILED: 0 SKIPPED: 0

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
---
 .../libssh2/libssh2/CVE-2026-66033.patch      | 45 +++++++++++++++++++
 .../recipes-support/libssh2/libssh2_1.11.1.bb |  1 +
 2 files changed, 46 insertions(+)
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66033.patch

diff --git a/meta/recipes-support/libssh2/libssh2/CVE-2026-66033.patch b/meta/recipes-support/libssh2/libssh2/CVE-2026-66033.patch
new file mode 100644
index 0000000000..bb046a6eae
--- /dev/null
+++ b/meta/recipes-support/libssh2/libssh2/CVE-2026-66033.patch
@@ -0,0 +1,45 @@
+From d1b6996c3b31ce6b60d5a820ecc33880e61ef0ae Mon Sep 17 00:00:00 2001
+From: Viktor Szakats <commit@vsz.me>
+Date: Thu, 23 Jul 2026 10:32:04 +0200
+Subject: [PATCH] openssl: fix potential OOB read/write with AES-GCM in
+ `ssh2_cipher_crypt()`
+
+By applying two bounds checks to non-debug builds.
+
+Reported-by: Vladimir Eli Tokarev
+Fixes GHSA-c4f7-cvfc-33j7
+Follow-up to 3c953c05d67eb1ebcfd3316f279f12c4b1d600b4 #797
+
+Closes #2401
+
+CVE: CVE-2026-66033
+Upstream-Status: Backport [https://github.com/libssh2/libssh2/commit/a2ed82d40964bbc0d64cd717aa0a5a892117d2e6]
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+ src/openssl.c | 10 ++++++----
+ 1 file changed, 6 insertions(+), 4 deletions(-)
+
+diff --git a/src/openssl.c b/src/openssl.c
+index eba05031..28ae1cc0 100644
+--- a/src/openssl.c
++++ b/src/openssl.c
+@@ -1042,13 +1042,15 @@ _libssh2_cipher_crypt(_libssh2_cipher_ctx * ctx,
+     const int aadlen = (is_aesgcm && IS_FIRST(firstlast)) ? 4 : 0;
+     /* size of AT, if present */
+     const int authenticationtag = IS_LAST(firstlast) ? authlen : 0;
+-    /* length to encrypt */
+-    const int cryptlen = (unsigned int)blocksize - aadlen - authenticationtag;
++    unsigned int cryptlen; /* length to encrypt */
+ 
+     (void)algo;
+ 
+-    assert(blocksize <= sizeof(buf));
+-    assert(cryptlen >= 0);
++    if(blocksize > sizeof(buf) ||
++       blocksize < (size_t)(aadlen + authenticationtag))
++        return 1;
++
++    cryptlen = (unsigned int)blocksize - aadlen - authenticationtag;
+ 
+ #if LIBSSH2_AES_GCM
+     /* First block */
diff --git a/meta/recipes-support/libssh2/libssh2_1.11.1.bb b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
index bd7d1f7b1d..de435a836d 100644
--- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb
+++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
@@ -17,6 +17,7 @@ SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://CVE-2025-15661-2.patch \
            file://CVE-2025-15661-3.patch \
            file://CVE-2026-66032.patch \
+           file://CVE-2026-66033.patch \
            "
 
 SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7"

[wrynose][PATCH v2 3/4] libssh2: fix CVE-2026-66034

[Jaipaul Cheernam]

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2026-66034
https://github.com/libssh2/libssh2/commit/a13bb6c773f0d55ad1628cede57e99804cd898d9

libssh2 ptest results (qemux86-64):
  before: PASSED: 1 FAILED: 0 SKIPPED: 0
  after:  PASSED: 1 FAILED: 0 SKIPPED: 0

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
---
 .../libssh2/libssh2/CVE-2026-66034.patch      | 40 +++++++++++++++++++
 .../recipes-support/libssh2/libssh2_1.11.1.bb |  1 +
 2 files changed, 41 insertions(+)
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66034.patch

diff --git a/meta/recipes-support/libssh2/libssh2/CVE-2026-66034.patch b/meta/recipes-support/libssh2/libssh2/CVE-2026-66034.patch
new file mode 100644
index 0000000000..906356baf2
--- /dev/null
+++ b/meta/recipes-support/libssh2/libssh2/CVE-2026-66034.patch
@@ -0,0 +1,40 @@
+From 16720054e0b3f02e36f31dd04add534d73d4a18d Mon Sep 17 00:00:00 2001
+From: Viktor Szakats <commit@vsz.me>
+Date: Sat, 4 Jul 2026 11:19:49 +0200
+Subject: [PATCH] publickey: fix potential OOB read in
+ `libssh2_publickey_list_fetch()`
+
+Reported-by: Vladimir Eli Tokarev
+Fixes GHSA-w6g9-cpfp-22gc
+
+Closes #2202
+
+Backport adaptations:
+- The upstream fix uses ssh2_err() which is not available in libssh2
+  1.11.1. Replace with the equivalent _libssh2_error() call.
+
+CVE: CVE-2026-66034
+Upstream-Status: Backport [https://github.com/libssh2/libssh2/commit/a13bb6c773f0d55ad1628cede57e99804cd898d9]
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+ src/publickey.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/src/publickey.c b/src/publickey.c
+index 9c9fa618..f3776d2d 100644
+--- a/src/publickey.c
++++ b/src/publickey.c
+@@ -988,6 +988,13 @@ libssh2_publickey_list_fetch(LIBSSH2_PUBLICKEY * pkey, unsigned long *num_keys,
+                 }
+ 
+                 if(comment_len) {
++                    if(pkey->listFetch_s + comment_len >
++                       pkey->listFetch_data + pkey->listFetch_data_len) {
++                        _libssh2_error(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
++                                       "ListFetch data too short");
++                        goto err_exit;
++                    }
++
+                     list[keys].num_attrs = 1;
+                     list[keys].attrs =
+                         LIBSSH2_ALLOC(session,
diff --git a/meta/recipes-support/libssh2/libssh2_1.11.1.bb b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
index de435a836d..7d3063d930 100644
--- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb
+++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
@@ -18,6 +18,7 @@ SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://CVE-2025-15661-3.patch \
            file://CVE-2026-66032.patch \
            file://CVE-2026-66033.patch \
+           file://CVE-2026-66034.patch \
            "
 
 SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7"

[wrynose][PATCH v2 4/4] libssh2: fix CVE-2026-66035

[Jaipaul Cheernam]

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2026-66035
https://github.com/libssh2/libssh2/commit/42e33d81577ed4b95d4b4f6f845e5ee8efe5eeb4

libssh2 ptest results (qemux86-64):
  before: PASSED: 1 FAILED: 0 SKIPPED: 0
  after:  PASSED: 1 FAILED: 0 SKIPPED: 0

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
---
 .../libssh2/libssh2/CVE-2026-66035.patch      | 56 +++++++++++++++++++
 .../recipes-support/libssh2/libssh2_1.11.1.bb |  1 +
 2 files changed, 57 insertions(+)
 create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-66035.patch

diff --git a/meta/recipes-support/libssh2/libssh2/CVE-2026-66035.patch b/meta/recipes-support/libssh2/libssh2/CVE-2026-66035.patch
new file mode 100644
index 0000000000..7c15f92fb6
--- /dev/null
+++ b/meta/recipes-support/libssh2/libssh2/CVE-2026-66035.patch
@@ -0,0 +1,56 @@
+From 6671019836476649792eea12868a370133be1abe Mon Sep 17 00:00:00 2001
+From: Viktor Szakats <commit@vsz.me>
+Date: Fri, 3 Jul 2026 18:22:55 +0200
+Subject: [PATCH] transport: fix potential heap overflow on ETM decrypt
+
+Reported-by: Vladimir Eli Tokarev
+Fixes GHSA-6c79-444r-wx26
+
+Closes #2198
+
+Backport adaptations:
+- The upstream fix uses SSH2_SAFEFREE() to safely release allocated
+  memory and reset the pointer. Since SSH2_SAFEFREE() is not available
+  in libssh2 1.11.1, replace its usage with the equivalent NULL check,
+  LIBSSH2_FREE(), and pointer reset sequence.
+- The upstream fix renames decrypt() to transport_decrypt(). Since this
+  rename is not present in libssh2 1.11.1, retain the original
+  decrypt() function name.
+
+CVE: CVE-2026-66035
+Upstream-Status: Backport [https://github.com/libssh2/libssh2/commit/42e33d81577ed4b95d4b4f6f845e5ee8efe5eeb4]
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+ src/transport.c | 12 +++++++++++-
+ 1 file changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/src/transport.c b/src/transport.c
+index d147505b..9f386e75 100644
+--- a/src/transport.c
++++ b/src/transport.c
+@@ -242,6 +242,17 @@ fullpacket(LIBSSH2_SESSION * session, int encrypted /* 1 or 0 */ )
+                 unsigned char *decrypt_buffer;
+                 int blocksize = session->remote.crypt->blocksize;
+ 
++                if(p->total_num < mac_len + 4 + (size_t)blocksize) {
++                    if(p->payload) {
++                        LIBSSH2_FREE(session, p->payload);
++                        p->payload = NULL;
++                    }
++                    return LIBSSH2_ERROR_DECRYPT;
++                }
++                decrypt_size = (ssize_t)(p->total_num - mac_len - 4);
++
++                first_block[0] = 0;
++
+                 rc = decrypt(session, p->payload + 4,
+                              first_block, blocksize, FIRST_BLOCK);
+                 if(rc) {
+@@ -249,7 +260,6 @@ fullpacket(LIBSSH2_SESSION * session, int encrypted /* 1 or 0 */ )
+                 }
+ 
+                 /* we need buffer for decrypt */
+-                decrypt_size = p->total_num - mac_len - 4;
+                 decrypt_buffer = LIBSSH2_ALLOC(session, decrypt_size);
+                 if(!decrypt_buffer) {
+                     return LIBSSH2_ERROR_ALLOC;
diff --git a/meta/recipes-support/libssh2/libssh2_1.11.1.bb b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
index 7d3063d930..faa34ba3eb 100644
--- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb
+++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
@@ -19,6 +19,7 @@ SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://CVE-2026-66032.patch \
            file://CVE-2026-66033.patch \
            file://CVE-2026-66034.patch \
+           file://CVE-2026-66035.patch \
            "
 
 SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7"