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

[Jaipaul Cheernam <jaipaul.cheernam@est.tech>]

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 a87c013017..999c3db55a 100644
--- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb
+++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
@@ -15,6 +15,7 @@ SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://CVE-2026-55199.patch \
            file://CVE-2026-66032.patch \
            file://CVE-2026-66033.patch \
+           file://CVE-2026-66034.patch \
            "
 
 SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7"