Vulnerability record · CVE-2026-0967 · published 26 March 2026
CVE-2026-0967: Libssh inefficient regular expression (redos) vulnerability
Libssh · Libssh
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.
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:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Affected products
2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
References
| Link | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:18160 | |
| https://access.redhat.com/errata/RHSA-2026:18683 | |
| https://access.redhat.com/security/cve/CVE-2026-0967 | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2436981 | Third Party Advisory |
| https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/ | Release Notes |
Track CVE-2026-0967 inside VULONE
Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.
Related vulnerabilities
Same products first, then exploited flaws of the same weakness class.
Source: NIST National Vulnerability Database (record CVE-2026-0967), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.
