CVE-2026-55199: libssh2 - Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler
Overview
- Severity
- Medium (CVSS 5.9)
- CVSS Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2026-Jun
- Released
- 2026-06-27
- Last Updated
- 2026-06-28
- EPSS Score
- 0.41% (percentile: 32.6%)
Affected Products (4)
Other
- 21431-17084
- 21485-17084
- 21318-17084
- 20881-17084
Revision History
- 2026-06-27: Information published.
- 2026-06-28: Information published.