Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Libssh | Libssh | <= 0.11.3 |
| Redhat | Enterprise Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:18160
- https://access.redhat.com/errata/RHSA-2026:18683
- https://access.redhat.com/security/cve/CVE-2026-0967Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2436981Third Party Advisory
- https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/Release Notes
FAQ
What is CVE-2026-0967?
CVE-2026-0967 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 ...
How severe is CVE-2026-0967?
CVE-2026-0967 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-0967?
Check the references section above for vendor advisories and patch information. Affected products include: Libssh Libssh, Redhat Enterprise Linux.