CVE-2026-0967

MEDIUM

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

Title source: cna

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.

References (5)

Core 5

Core References

Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat

https://access.redhat.com/security/cve/CVE-2026-0967

Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat

RHBZ#2436981

https://bugzilla.redhat.com/show_bug.cgi?id=2436981

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:18160

https://access.redhat.com/errata/RHSA-2026:18160

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:18683

https://access.redhat.com/errata/RHSA-2026:18683

https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/

Scores

CVSS v3 5.5

EPSS 0.0022

EPSS Percentile 12.7%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-1333

Status published

Products (12)

libssh/libssh < 0.11.3

Red Hat/Red Hat Enterprise Linux 10

Red Hat/Red Hat Enterprise Linux 10 0:0.12.0-2.el10

Red Hat/Red Hat Enterprise Linux 6

Red Hat/Red Hat Enterprise Linux 7

Red Hat/Red Hat Enterprise Linux 8

Red Hat/Red Hat Enterprise Linux 9

Red Hat/Red Hat Enterprise Linux 9 0:0.10.4-18.el9

Red Hat/Red Hat Hardened Images

Red Hat/Red Hat OpenShift Container Platform 4

... and 2 more

Published Mar 26, 2026

Tracked Since Mar 27, 2026