CVE-2026-91166
Severity CVSS v4.0:
Pending analysis
Type:
CWE-297
Improper Validation of Certificate with Host Mismatch
Publication date:
21/09/2026
Last modified:
24/09/2026
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.
Impact
Base Score 3.x
5.70
Severity 3.x
MEDIUM
References to Advisories, Solutions, and Tools
- https://github.com/warp-tech/warpgate/commit/fb66ff74f979c22054f4d348cc0d9065cc67e5d3
- 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