5.5

CVE-2026-0967

Libssh: libssh: denial of service via inefficient regular expression processing

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Libssh ≫ Libssh Version <= 0.11.3
Redhat ≫ Enterprise Linux Version 9.0
Redhat ≫ Enterprise Linux Version 10.0
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.22% 0.127
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
RedHat 2.2 0.8 1.4
CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
CWE-1333 Inefficient Regular Expression Complexity

The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.

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
https://access.redhat.com/errata/RHSA-2026:18683
https://access.redhat.com/errata/RHSA-2026:18160
https://access.redhat.com/security/cve/CVE-2026-0967
Third Party Advisory