From: Daniel Turull <[email protected]> Backport patch to fix CVE-2026-55199. https://nvd.nist.gov/vuln/detail/CVE-2026-55199
Upstream fix: https://github.com/libssh2/libssh2/commit/17626857d20b3c9a1addfa45979dadcee1cd84a4 Tested with ptest: Before: PASSED: 3, FAILED: 0, SKIPPED: 0 After: PASSED: 3, FAILED: 0, SKIPPED: 0 Reviewed-by: Anders Heimer <[email protected] Signed-off-by: Daniel Turull <[email protected]> --- This patch should be applied to scarthgap and wrynose as well. It is the same libss2 version. Also it should be applied after the "libssh2: fix CVE-2026-55200" Or do you want me to resend them as a series to the 3 releases? --- .../libssh2/libssh2/CVE-2026-55199.patch | 44 +++++++++++++++++++ .../recipes-support/libssh2/libssh2_1.11.1.bb | 1 + 2 files changed, 45 insertions(+) create mode 100644 meta/recipes-support/libssh2/libssh2/CVE-2026-55199.patch diff --git a/meta/recipes-support/libssh2/libssh2/CVE-2026-55199.patch b/meta/recipes-support/libssh2/libssh2/CVE-2026-55199.patch new file mode 100644 index 0000000000..81815486ad --- /dev/null +++ b/meta/recipes-support/libssh2/libssh2/CVE-2026-55199.patch @@ -0,0 +1,44 @@ +From b5cb1c1781ba5f275485f65855d61faaba6542b2 Mon Sep 17 00:00:00 2001 +From: TristanInSec <[email protected]> +Date: Wed, 15 Apr 2026 14:51:08 -0400 +Subject: [PATCH] packet: check `_libssh2_get_string()` return in `EXT_INFO` + handler + +The `SSH_MSG_EXT_INFO` handler discards the return values from +`_libssh2_get_string()` when parsing extension name/value pairs. When +the buffer is exhausted before all claimed extensions are parsed, +the loop continues with no-op iterations until `nr_extensions` reaches +zero. + +The `nr_extensions >= 1024` cap limits the worst case, but the loop +should still break on parse failure for correctness and consistency +with other parsers in this file (e.g. `SSH_MSG_CHANNEL_OPEN`, +`SSH_MSG_KEXINIT`) that check `_libssh2_get_string()` return values. + +Closes #1864 + +CVE: CVE-2026-55199 +Upstream-Status: Backport [https://github.com/libssh2/libssh2/commit/17626857d20b3c9a1addfa45979dadcee1cd84a4] + +Signed-off-by: Daniel Turull <[email protected]> +--- + src/packet.c | 6 ++++-- + 1 file changed, 4 insertions(+), 2 deletions(-) + +diff --git a/src/packet.c b/src/packet.c +index 6da14e9f..ebaddae5 100644 +--- a/src/packet.c ++++ b/src/packet.c +@@ -868,8 +868,10 @@ _libssh2_packet_add(LIBSSH2_SESSION * session, unsigned char *data, + + nr_extensions -= 1; + +- _libssh2_get_string(&buf, &name, &name_len); +- _libssh2_get_string(&buf, &value, &value_len); ++ if(_libssh2_get_string(&buf, &name, &name_len)) ++ break; ++ if(_libssh2_get_string(&buf, &value, &value_len)) ++ break; + + if(name && value) { + _libssh2_debug((session, diff --git a/meta/recipes-support/libssh2/libssh2_1.11.1.bb b/meta/recipes-support/libssh2/libssh2_1.11.1.bb index 5ffc40b8fc..2407ed34d9 100644 --- a/meta/recipes-support/libssh2/libssh2_1.11.1.bb +++ b/meta/recipes-support/libssh2/libssh2_1.11.1.bb @@ -12,6 +12,7 @@ SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \ file://0001-Return-error-if-user-KEX-methods-are-invalid.patch \ file://CVE-2026-7598.patch \ file://CVE-2026-55200.patch \ + file://CVE-2026-55199.patch \ " SRC_URI[sha256sum] = "d9ec76cbe34db98eec3539fe2c899d26b0c837cb3eb466a56b0f109cabf658f7" -- 2.51.0
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