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A flaw was found in libssh's handling of key exchange (KEX) processes when a client repeatedly sends incorrect KEX guesses. The library fails to free memory during these rekey operations, which can gradually exhaust system memory. This issue can lead to crashes on the client side, particularly when using libgcrypt, which impacts application stability and availability.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libssh-configUpgrade libsshUpgrade libssh-devel | May 27, 2026 | May 19, 2026 |
| Amazon_linux_2023 | — | Upgrade libsshUpgrade libssh-configUpgrade libssh-debuginfoUpgrade libssh-debugsourceUpgrade libssh-devel | Nov 11, 2025 | Sep 9, 2025 |
| Debian | — | Upgrade libssh | Nov 28, 2025 | Nov 28, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade libssh | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp11 | — | Upgrade libssh | Dec 12, 2025 | Dec 11, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade libssh | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade libssh | Dec 12, 2025 | Dec 11, 2025 |
| Oracle_linux | — | Upgrade libssh-configUpgrade libsshUpgrade libssh-devel | Oct 22, 2026 | Sep 9, 2025 |
| Redhat_linux | — | Upgrade libssh-debugsourceUpgrade libsshUpgrade libssh-debuginfoUpgrade libssh-configUpgrade libssh-develNo solution exists | May 20, 2026 | Sep 9, 2025 |
| Rocky_linux | — | Upgrade libssh-debuginfoUpgrade libssh-debugsourceUpgrade libsshUpgrade libssh-devel | Jun 1, 2026 | May 28, 2026 |
| Suse | — | Upgrade libssh4-32bitUpgrade libssh-devel-docUpgrade libssh-develUpgrade libssh4Upgrade libssh-config | Dec 5, 2025 | Sep 26, 2025 |
| Ubuntu | — | Upgrade libssh-4Upgrade libssh-4 (Ubuntu Pro) | Feb 19, 2026 | Sep 9, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jun 29, 2026 | Sep 9, 2025 |
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