libssh2: fix CVE-2026-66033

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2026-66033
a2ed82d409

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

(From OE-Core rev: bd8afadd38a27c0e143cf7b0096c2abded569f82)

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
Signed-off-by: Fabien Thomas <fabien.thomas@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>

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 */

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"