5.5Medium
Libssh Libssh
CVE-2026-0967
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.
What this means for your business
- It affects Libssh. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it only with access to the machine itself, without a login, but only after tricking someone into an action such as opening a file or a link.
What to do
- 1Check whether your company or your suppliers run Libssh, and which version. The affected versions are listed further down this page.
- 2If you do, follow the vendor's guidance. No patch reference has been published yet.
Not sure if your company is exposed?
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Scoring
- CVSS
- 5.5 (v3.1)
- Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H- Weakness
- CWE-1333
- Assigned by
- secalert@redhat.com
Dates
- Published
- 2026-03-26
- Last modified
- 2026-09-01
- Sources
- NVD
Affected products
- Libssh Libssh- 0.11.3
- Redhat Enterprise Linux9.0, 10.0
As listed in the NVD configuration data. Not a statement about your estate.