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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libssh-configUpgrade libsshUpgrade libssh-devel | Dec 2, 2025 | Nov 24, 2025 |
| Alpine Linux | — | Upgrade libssh | Aug 8, 2025 | Jul 4, 2025 |
| Debian | — | Upgrade libssh | Jun 26, 2025 | Jun 26, 2025 |
| Dell Powerstore Dsa2025429 | — | Upgrade Dell PowerStoreOS to the latest version | Dec 3, 2025 | Dec 2, 2025 |
| Dell Powerstore Dsa2026039 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Jan 6, 2026 |
| Huawei Euleros 2_0_sp10 | — | Upgrade libssh | Nov 12, 2025 | Oct 10, 2025 |
| Huawei Euleros 2_0_sp11 | — | Upgrade libssh | Oct 14, 2025 | Oct 10, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade libssh | Nov 12, 2025 | Oct 10, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade libssh | Nov 21, 2025 | Oct 10, 2025 |
| Nutanix Ahv | — | Upgrade Nutanix AHV to the latest version | Jun 5, 2026 | Feb 13, 2026 |
| Oracle_linux | — | Upgrade libssh-develUpgrade libssh-configUpgrade libssh | Nov 28, 2025 | Jun 24, 2025 |
| Redhat_linux | — | Upgrade libssh-configUpgrade libssh-debuginfoUpgrade libssh-develUpgrade libssh-debugsourceUpgrade libsshNo solution exists | Jul 9, 2025 | Jul 4, 2025 |
| Rocky_linux | — | Upgrade libssh-debugsourceUpgrade libsshUpgrade libssh-develUpgrade libssh-debuginfo | Feb 5, 2026 | Nov 25, 2025 |
| Suse | — | Upgrade libssh4-32bitUpgrade libssh4Upgrade libssh-develUpgrade libssh-config | Jul 7, 2025 | Jul 4, 2025 |
| Ubuntu | — | Upgrade libssh-4 | Jul 8, 2025 | Jul 4, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 2, 2025 | Jul 4, 2025 |
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