Denial of Service Vulnerability in libssh Affecting Remote Client Configurations
CVE-2026-0967

2.2LOW

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
26 March 2026

What is CVE-2026-0967?

A vulnerability exists in libssh that allows a remote attacker to exploit client configuration files or known_hosts files. By crafting certain malicious hostnames, the attacker can trigger inefficient regular expression backtracking in the match_pattern() function. This can lead to significant timeouts and resource exhaustion, ultimately resulting in a Denial of Service (DoS) condition for affected clients. Proper configuration and security measures are essential to mitigate potential disruptions.

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References

https://access.redhat.com/security/cve/CVE-2026-0967
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2436981
issue-trackingx_refsource_REDHAT
https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-...

CVSS V3.0

Score:
2.2
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Jakub Jelen (libssh) and Kang Yang for reporting this issue.
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