A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libssh-configUpgrade libsshUpgrade libssh-devel | May 27, 2026 | May 19, 2026 |
| Alpine Linux | — | Upgrade libssh | Apr 13, 2026 | Mar 26, 2026 |
| Amazon_linux_2023 | — | Upgrade libssh-debuginfoUpgrade libssh-configUpgrade libssh-debugsourceUpgrade libssh-develUpgrade libssh | Mar 27, 2026 | Feb 10, 2026 |
| Debian | — | Upgrade libssh | Aug 3, 2026 | Aug 3, 2026 |
| Redhat_linux | — | Upgrade libssh-develUpgrade libssh-debuginfoNo solution existsUpgrade libsshUpgrade libssh-configUpgrade libssh-debugsource | May 20, 2026 | Feb 10, 2026 |
| Rocky_linux | — | Upgrade libssh-develUpgrade libssh-debugsourceUpgrade libsshUpgrade libssh-debuginfo | Jun 1, 2026 | May 28, 2026 |
| Suse | — | Upgrade libssh-configUpgrade libssh4Upgrade libssh4-32bitUpgrade libssh-develUpgrade libssh-devel-doc | Mar 4, 2026 | Feb 17, 2026 |
| Ubuntu | — | Upgrade libssh-4 (Ubuntu Pro)Upgrade libssh-4 | Feb 19, 2026 | Feb 13, 2026 |
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