Vulnerability Description
Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. From 0.25.0 until 0.27.6, the browser SSH path in warpgate-web-ssh/src/manager.rs handles RCEvent::HostKeyUnknown without the presenting hop identity and instead passes ssh_options.host and ssh_options.port for the final target to KnownHosts::trust. In Prompt and AutoAccept modes, a jump host key can therefore be stored for the target address. A machine later presenting the jump host key at the target address can be accepted as the target, allowing interception of user traffic and a newly issued certificate when certificate authentication is used. The native SSH path is unaffected because it tracks each hop separately. This issue is fixed in version 0.27.6.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/warp-tech/warpgate/commit/fb66ff74f979c22054f4d348cc0d9065cc6
- https://github.com/warp-tech/warpgate/releases/tag/v0.27.6
- https://github.com/warp-tech/warpgate/security/advisories/GHSA-w9jj-vpw3-5r8f
- https://github.com/warp-tech/warpgate/security/advisories/GHSA-w9jj-vpw3-5r8f
FAQ
What is CVE-2026-91166?
CVE-2026-91166 is a vulnerability with a CVSS score of 5.7 (MEDIUM). Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. From 0.25.0 until 0.27.6, the browser SSH path in warpgate-web-ssh/src/manager.rs handles RCEvent::HostKeyUnknown without the pr...
How severe is CVE-2026-91166?
CVE-2026-91166 has been rated MEDIUM with a CVSS base score of 5.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-91166?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.