« List of all CVEs

CVE-2026-0967

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

Published: 3/26/2026 Last updated: 5/19/2026 Reserved: 1/14/2026

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.

CNA assigner: redhat (53f830b8-0a3f-465b-8143-3b8a9948e749) Requested by: n/a

Metrics

Version Score Severity Vector String
3.0 2.2 Low CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L

Opam packages affected (1)

libssh

Products affected (16)

Product Vendor Version
Red Hat Enterprise Linux 10 Red Hat n/a
Red Hat Enterprise Linux 9 Red Hat Java SE: 8u181, 11
Red Hat Enterprise Linux 9 Red Hat Java SE Embedded: 8u181
Red Hat Enterprise Linux 8 Red Hat 3.5.7
Red Hat Enterprise Linux 10 Red Hat < publication
Red Hat Enterprise Linux 9 Red Hat < publication
Red Hat Enterprise Linux 9 Red Hat < publication
Red Hat Enterprise Linux 8 Red Hat Cisco Firepower System Software
Red Hat Enterprise Linux 7 Red Hat < 2.5.4
Red Hat Enterprise Linux 6 Red Hat < publication
Red Hat Hardened Images Red Hat n/a
Red Hat Hardened Images Red Hat n/a
Red Hat Enterprise Linux 6 Red Hat 3.7.1
Red Hat Enterprise Linux 7 Red Hat 3.6.5
Red Hat OpenShift Container Platform 4 Red Hat n/a
Red Hat OpenShift Container Platform 4 Red Hat n/a

References (10)

Credits (2)