SUSE-SU-2026:23245-1

This update for libssh2_org fixes the following issues:

Security issues fixed:

• CVE-2025-15661: out-of-bounds heap read vulnerability in the sftp_symlink() function in src/sftp.c (bsc#1268546).
• CVE-2026-7598: integer overflow in function userauth_password of file src/userauth.c (bsc#1263890).
• CVE-2026-58050: heap buffer overflow due to missing bounds check in attribute count of publickey-subsystem response (bsc#1269568).
• CVE-2026-58051: uninitialized pointer freed when malformed responses are sent by an SSH server (bsc#1269567).
• CVE-2026-66032: arbitrary code execution via double-free in SFTP session (bsc#1272737).
• CVE-2026-66033: denial of service via integer underflow in AES-GCM cipher negotiation (bsc#1272736).
• CVE-2026-66034: information disclosure and potential arbitrary code execution via heap out-of-bounds read (bsc#1272735).
• CVE-2026-66035: arbitrary code execution via heap buffer overflow during SSH negotiation (bsc#1272734).

Other updates and bugfixes:

• Fix an issue with Encrypt-then-MAC family (bsc#1221622).
  • Test the ETM feature in the remote end's configuration when receiving data. Upstream issue: #1331.
• Always add the KEX pseudo-methods ext-info-c and kex-strict-c-v00@openssh.com when configuring custom method list (bsc#1218971).
  • The strict-kex extension is announced in the list of available KEX methods. However, when the default KEX method list is modified or replaced, the extension is not added back automatically.