CVE-2026-0967
Libssh: libssh: denial of service via inefficient regular expression processing
- State
- Published
- Severity
- 2.2 Low
- Published
- Mar 26, 2026
- Updated
- Sep 1, 2026
- Reserved
- Jan 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.0 | 2.2 Low | CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L | redhat |
Weaknesses
- CWE-1333 Inefficient Regular Expression Complexity
Affected Products
| Product | Versions |
|---|---|
Red Hat Enterprise Linux 10Red Hat |
|
Red Hat Enterprise Linux 9Red Hat |
|
Red Hat Enterprise Linux 9Red Hat |
|
Red Hat Enterprise Linux 6Red Hat | |
Red Hat Enterprise Linux 7Red Hat | |
Red Hat Enterprise Linux 8Red Hat | |
Red Hat Hardened ImagesRed Hat | |
Red Hat OpenShift Container Platform 4Red Hat | |
Red Hat OpenShift Container Platform 4Red Hat |
References
- RHSA-2026:18160vendor-advisory
- RHSA-2026:18683vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-0967vdb-entry
- RHBZ#2436981issue-tracking
- https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/
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