libssh: A flaw was found in libssh
CVE-2026-59851 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-59851, released July 31, 2026. It is not reported as exploited. Patch Radar priority: High.
A flaw was found in libssh. On servers with GSSAPIKeyExchange enabled, the gssapi-keyex path does not verify whether the authenticated Kerberos principal is authorized for the requested local user, allowing authenticated clients to log in as arbitrary users.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libssh · Debian 14 | 0.12.1-1 | DEBIAN-CVE-2026-59851 | Jul 31, 2026 |
| libssh · RHEL 10 | 0.12.0-3.el10_2 | RHSA-2026:55855 | Aug 18, 2026 |
| libssh · almalinux 10 | 0.12.0-3.el10_2 | ALSA-2026:55855 | Aug 17, 2026 |
| libssh · ol 10 | 0:0.12.0-3.el10_2 | ELSA-2026-55855 | Aug 17, 2026 |
| libssh · rocky 10 | 0:0.12.0-3.el10_2 | RLSA-2026:55855 | Aug 18, 2026 |
| libssh-config · almalinux 10 | 0.12.0-3.el10_2 | ALSA-2026:55855 | Aug 17, 2026 |
| libssh-config · ol 10 | 0:0.12.0-3.el10_2 | ELSA-2026-55855 | Aug 17, 2026 |
| libssh-devel · almalinux 10 | 0.12.0-3.el10_2 | ALSA-2026:55855 | Aug 17, 2026 |
| libssh-devel · ol 10 | 0:0.12.0-3.el10_2 | ELSA-2026-55855 | Aug 17, 2026 |
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