Vulnerability in Libssh
CVE-2026-0967
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (11.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 11.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Libssh
- Red Hat Enterprise Linux 10 — versions 0:0.12.0-2.el10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9 — versions 0:0.10.4-18.el9
- Red Hat Hardened Images
- Red Hat Openshift Container Platform 4
- Red Hat Enterprise Linux — versions 9.0, 10.0
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-0967 (Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Third Party Advisory)
- www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/ (Release Notes)
- access.redhat.com/errata/RHSA-2026:18160 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:18683 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-0967?
- CVE-2026-0967 is a medium-severity vulnerability in Libssh, classified under Inefficient Regular Expression Complexity. CVSS score: 5.5/10. Published 2026-03-26.
- How severe is CVE-2026-0967?
- Medium severity. CVSS v3 base score is 5.5 out of 10.