Bug 2436981 (CVE-2026-0967) - CVE-2026-0967 libssh: libssh: Denial of Service via inefficient regular expression processing
Summary: CVE-2026-0967 libssh: libssh: Denial of Service via inefficient regular expre...
Keywords:
Status: NEW
Alias: CVE-2026-0967
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2442914
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-04 23:44 UTC by OSIDB Bzimport
Modified: 2026-06-02 08:28 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:18160 0 None None None 2026-05-19 08:44:32 UTC
Red Hat Product Errata RHSA-2026:18683 0 None None None 2026-05-19 13:00:54 UTC

Description OSIDB Bzimport 2026-02-04 23:44:40 UTC 
The function `match_pattern()` is used to match conditionals in client
configuration files or known hosts against the hostname the client is
connecting to.

When the configuration file or known_hosts file is controlled by the
attacker, connecting to specific hostnames could cause timeouts and
resource exhaustion due to the ineffective backtracking of complex
regular expressions.

The pattern matching was modified to avoid the needless backtracing.
Comment 2 errata-xmlrpc 2026-05-19 08:44:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:18160 https://access.redhat.com/errata/RHSA-2026:18160
Comment 3 errata-xmlrpc 2026-05-19 13:00:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

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