A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libsshUpgrade libssh-configUpgrade libssh-devel | Oct 11, 2026 | Sep 1, 2026 |
| Alpine Linux | — | Upgrade libssh | Jul 29, 2026 | Jul 21, 2026 |
| Debian | — | Upgrade libssh | Aug 3, 2026 | Aug 3, 2026 |
| Redhat_linux | — | Upgrade libsshUpgrade libssh-develUpgrade libssh-debuginfoUpgrade libssh-configUpgrade libssh-debugsource | Jul 23, 2026 | Jul 21, 2026 |
| Rocky_linux | — | Upgrade libssh-debugsourceUpgrade libssh-debuginfoUpgrade libssh-develUpgrade libssh | Aug 20, 2026 | Aug 18, 2026 |
| Ubuntu | — | Upgrade libssh-4 | Aug 31, 2026 | Aug 31, 2026 |
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