CVE-2026-0967CWE-1333

CVE-2026-0967

Medium · published March 27, 2026

CVSS v3.1
5.5
EPSS
0%
Percentile
12.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00223 · 12.2th percentile
Weakness
CWE-1333 · Inefficient Regular Expression Complexity
Published
2026-03-27T01:17Z
Affected products (3)
ProductVersionsFixed in
libssh/libssh≤ 0.11.3—
redhat/enterprise_linuxall versions—
redhat/enterprise_linuxall versions—
References (5)
https://access.redhat.com/errata/RHSA-2026:18160 · [email protected]https://access.redhat.com/errata/RHSA-2026:18683 · [email protected]https://access.redhat.com/security/cve/CVE-2026-0967 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2436981 · [email protected]https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/ · [email protected]
EPSS history
Timeline
  • 26 MAR 20:06Z
    Libssh: libssh: denial of service via inefficient regular expression processing
    cvelistv5