A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | alma-upgrade-libsshalma-upgrade-libssh-configalma-upgrade-libssh-devel | Dec 2, 2025 | Nov 24, 2025 | |
| Alpine Linux | alpine-linux-upgrade-libssh | Aug 8, 2025 | Jul 4, 2025 | |
| Debian | debian-upgrade-libssh | Jun 26, 2025 | Jun 26, 2025 | |
| Dell Powerstore Dsa2025429 | dell-powerstoreos-upgrade-latest | Dec 3, 2025 | Dec 2, 2025 | |
| Dell Powerstore Dsa2026039 | dell-powerstoreos-upgrade-latest | Jan 13, 2026 | Jan 6, 2026 | |
| Huawei Euleros 2_0_sp10 | huawei-euleros-2_0_sp10-upgrade-libssh | Nov 12, 2025 | Oct 10, 2025 | |
| Huawei Euleros 2_0_sp11 | huawei-euleros-2_0_sp11-upgrade-libssh | Oct 14, 2025 | Oct 10, 2025 | |
| Huawei Euleros 2_0_sp12 | huawei-euleros-2_0_sp12-upgrade-libssh | Nov 12, 2025 | Oct 10, 2025 | |
| Huawei Euleros 2_0_sp13 | huawei-euleros-2_0_sp13-upgrade-libssh | Nov 21, 2025 | Oct 10, 2025 | |
| Nutanix Ahv | nutanix-ahv-upgrade-latest | Jun 5, 2026 | Feb 13, 2026 | |
| Oracle_linux | — | oracle-linux-upgrade-libsshoracle-linux-upgrade-libssh-configoracle-linux-upgrade-libssh-devel | Nov 28, 2025 | Jun 24, 2025 |
| Redhat_linux | redhat-upgrade-libsshredhat-upgrade-libssh-configredhat-upgrade-libssh-debuginforedhat-upgrade-libssh-debugsourceredhat-upgrade-libssh-devel | Jul 9, 2025 | Jul 4, 2025 | |
| Rocky_linux | rocky-upgrade-libsshrocky-upgrade-libssh-debuginforocky-upgrade-libssh-debugsourcerocky-upgrade-libssh-devel | Feb 5, 2026 | Nov 25, 2025 | |
| Suse | — | suse-upgrade-libssh-configsuse-upgrade-libssh-develsuse-upgrade-libssh4suse-upgrade-libssh4-32bit | Jul 7, 2025 | Jul 4, 2025 |
| Ubuntu | ubuntu-upgrade-libssh-4 | Jul 8, 2025 | Jul 4, 2025 | |
| Vmware Photon_os | vmware-photon_os_update_tdnf | Sep 2, 2025 | Jul 4, 2025 |
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