Skip to content
Fencer Vulns
low 2.2

CVE-2026-0967 json

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

published 2026-03-26 7 mo ago modified 2026-11-06 2 d ago also EUVD-2026-16332 , JLSEC-2026-782

cvss
2.2
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

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.

Patch / fix

  • julia libssh_jll 0.11.4+0
  • Red Hat Red Hat Enterprise Linux 10 0:0.12.0-2.el10
  • Red Hat Red Hat Enterprise Linux 9 0:0.10.4-18.el9
  • libssh Debian 12 0.10.6-0+deb12u3
  • libssh Debian 13 0.11.5-0+deb13u1
  • libssh Debian 14 0.12.0-1

debian advisories DEBIAN-CVE-2026-0967

  • libssh Ubuntu 22.04 LTS 0.9.6-2ubuntu0.22.04.6
  • libssh Ubuntu 24.04 LTS 0.10.6-2ubuntu0.3
  • libssh Ubuntu 25.10 0.11.2-1ubuntu0.2
  • libssh Ubuntu Pro 16.04 LTS 0.6.3-4.3ubuntu0.6+esm4
  • libssh Ubuntu Pro 18.04 LTS 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6
  • libssh Ubuntu Pro 20.04 LTS 0.9.3-2ubuntu2.5+esm3

ubuntu advisories UBUNTU-CVE-2026-0967

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libssh RHEL 9 0.10.4-18.el9
  • libssh-config RHEL 9 0.10.4-18.el9
  • libssh RHEL 10.2 0.12.0-2.el10
  • libssh-config RHEL 10.2 0.12.0-2.el10

red hat advisories RHSA-2026:18683RHSA-2026:18160

  • libssh SLE Micro 5.5, SLE Micro 5.4, SLE Micro 5.3 0.9.8-150400.3.17.1
  • libssh SLE Module for Basesystem 15 SP7, openSUSE Leap 15.6 0.9.8-150600.11.9.1
  • libssh Linux Micro 6.1 0.10.6-slfo.1.1_4.1
  • libssh Linux Micro 6.0 0.10.6-4.1
  • libssh SLE Micro 5.2 0.9.8-150200.13.15.1
  • libssh SLES LTSS Extended Security 12 SP5 0.6.3-12.28.1
  • libssh SLES LTSS Extended Security 12 SP5 0.9.8-3.21.1

suse advisories SUSE-SU-2026:1565-1SUSE-SU-2026:1344-1SUSE-SU-2026:0779-1SUSE-SU-2026:0778-1SUSE-SU-2026:20531-1SUSE-SU-2026:20524-1

  • libssh openSUSE Tumbleweed 0.11.4-1.1

opensuse advisories openSUSE-SU-2026:10203-1

  • libssh AlmaLinux 10 0.12.0-2.el10
  • libssh-config AlmaLinux 10 0.12.0-2.el10
  • libssh AlmaLinux 9 0.10.4-18.el9
  • libssh-config AlmaLinux 9 0.10.4-18.el9

almalinux advisories ALSA-2026:18160ALSA-2026:18683

  • libssh Rocky Linux 10 0.12.0-2.el10
  • libssh Rocky Linux 9 0.10.4-18.el9

rocky linux advisories RLSA-2026:18160RLSA-2026:18683

  • libssh Alpine 3.23 0.11.4-r0
  • libssh Alpine 3.24 0.12.0-r0

alpine advisories ALPINE-CVE-2026-0967

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libssh Azure Linux 3.0 0.10.6-7

azure linux advisories AZL-81092

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-0967 updated cvss 2.2

libssh: libssh: Denial of Service via inefficient regular expression processing

  • Red Hat Enterprise Linux 8 libssh, libssh-config Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Avoid using complex patterns in configuration files and known_hosts.”
  • Red Hat Enterprise Linux AppStream (v. 9) libssh-devel 0.10.4-18.el9, libssh-debuginfo 0.10.4-18.el9, libssh-debugsource 0.10.4-18.el9
    fixed: vendor fix “Avoid using complex patterns in configuration files and known_hosts.” RHSA-2026:18683
  • Red Hat Enterprise Linux AppStream (v. 10) libssh-devel 0.12.0-2.el10, libssh-debuginfo 0.12.0-2.el10, libssh-debugsource 0.12.0-2.el10
    fixed: vendor fix “Avoid using complex patterns in configuration files and known_hosts.” RHSA-2026:18160
  • Red Hat Enterprise Linux BaseOS (v. 9) libssh 0.10.4-18.el9, libssh-config 0.10.4-18.el9
    fixed: vendor fix “Avoid using complex patterns in configuration files and known_hosts.” RHSA-2026:18683
  • Red Hat Enterprise Linux BaseOS (v. 10) libssh 0.12.0-2.el10, libssh-config 0.12.0-2.el10
    fixed: vendor fix “Avoid using complex patterns in configuration files and known_hosts.” RHSA-2026:18160
  • Red Hat Enterprise Linux 6 libssh2 Red Hat Enterprise Linux 7 libssh2 Red Hat Hardened Images libssh2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 2.2 CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
OSV 3.0 2.2 CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia libssh_jll
<0.11.4+0
0.11.4+0

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • 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 Hardened Images
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-1333 Inefficient Regular Expression Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.