[scarthgap] [PATCH v2 1/2] libssh2: fix CVE-2026-55200

[<daniel.turull@ericsson.com>]

From: Daniel Turull <daniel.turull@ericsson.com>

Backport patch to fix CVE-2026-55200.
https://nvd.nist.gov/vuln/detail/CVE-2026-55200

Upstream fix:
  https://github.com/libssh2/libssh2/commit/97acf3dfda80c91c3a8c9f2372546301d4a1a7a8

Tested with ptest:
Before: PASSED: 3, FAILED: 0, SKIPPED: 0
After: PASSED: 3, FAILED: 0, SKIPPED: 0

Reviewed-by: Anders Heimer <anders.heimer@est.tech
Signed-off-by: Daniel Turull <daniel.turull@ericsson.com>
---
 .../libssh2/libssh2/CVE-2026-55200.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-2026-55200.patch

diff --git a/meta/recipes-support/libssh2/libssh2/CVE-2026-55200.patch b/meta/recipes-support/libssh2/libssh2/CVE-2026-55200.patch
new file mode 100644
index 0000000000..9a71277cce
--- /dev/null
+++ b/meta/recipes-support/libssh2/libssh2/CVE-2026-55200.patch
@@ -0,0 +1,36 @@
+From df0b03ee5ef12f3a46fccc0fc688ebfb91702972 Mon Sep 17 00:00:00 2001
+From: Will Cosgrove <will@panic.com>
+Date: Fri, 12 Jun 2026 15:57:44 -0700
+Subject: [PATCH] transport.c: Additional boundary checks for packet length
+ (#2052)
+
+Add additional bounds checking on packet length to prevent OOB write.
+
+Credit: [TristanInSec](https://github.com/TristanInSec)
+
+CVE: CVE-2026-55200
+Upstream-Status: Backport [https://github.com/libssh2/libssh2/commit/97acf3dfda80c91c3a8c9f2372546301d4a1a7a8]
+
+Signed-off-by: Daniel Turull <daniel.turull@ericsson.com>
+---
+ src/transport.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/src/transport.c b/src/transport.c
+index e1120656..d147505b 100644
+--- a/src/transport.c
++++ b/src/transport.c
+@@ -639,8 +639,12 @@ int _libssh2_transport_read(LIBSSH2_SESSION * session)
+                 total_num = 4;
+ 
+                 p->packet_length = _libssh2_ntohu32(block);
+-                if(p->packet_length < 1)
++                if(p->packet_length < 1) {
+                     return LIBSSH2_ERROR_DECRYPT;
++                }
++                else if(p->packet_length > LIBSSH2_PACKET_MAXPAYLOAD) {
++                    return LIBSSH2_ERROR_OUT_OF_BOUNDARY;
++                }
+ 
+                 /* total_num may include size field, however due to existing
+                  * logic it needs to be removed after the entire packet is read
diff --git a/meta/recipes-support/libssh2/libssh2_1.11.1.bb b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
index 2284d054b1..d6ee97f7ed 100644
--- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb
+++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb
@@ -11,6 +11,7 @@ SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://run-ptest \
            file://0001-Return-error-if-user-KEX-methods-are-invalid.patch \
            file://CVE-2026-7598.patch \
+           file://CVE-2026-55200.patch \
            "
 
 SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7"