Buffer Underwrite (Buffer Underflow) Affecting libssh package, versions [,0.11.4)
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-CONAN-LIBSSH-15265419
- published11 Feb 2026
- disclosed10 Feb 2026
- creditJun Xu, Kang Yang, Yunhang Zhang
Introduced: 10 Feb 2026
CVE-2026-0966 (opens in a new tab)How to fix?
Upgrade libssh to version 0.11.4 or higher.
Overview
Affected versions of this package are vulnerable to Buffer Underwrite (Buffer Underflow) in the ssh_get_hexa() function on invalid input. An attacker can cause a buffer underflow and potentially execute arbitrary code or crash the application by supplying specially crafted input.
Workaround
This vulnerability can be mitigated by disabling GSSAPI authentication if it is not required, or by reducing the LogLevel in the sshd_config file to a value lower than SSH_LOG_PACKET (e.g., INFO).