Buffer Underflow The advisory has been revoked - it doesn't affect any version of package libssh2 (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-LIBSSH2-15995311
- published12 Apr 2026
- disclosed10 Feb 2026
Introduced: 10 Feb 2026
CVE-2026-0966 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libssh2 package and not the libssh2 package as distributed by RHEL.
A flaw was found in libssh. The API function ssh_get_hexa() is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is set to SSH_LOG_PACKET (3) or higher. Successful exploitation could lead to a self-Denial of Service of the per-connection daemon process.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2433121
- https://access.redhat.com/security/cve/CVE-2026-0966
- https://access.redhat.com/errata/RHSA-2026:18160
- https://access.redhat.com/errata/RHSA-2026:7067
- https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/
- https://access.redhat.com/errata/RHSA-2026:18683