Warpgate: Web SSH stores a jump host's key against the target's address, so it validates as the target

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-91166
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-21 19:17:15 UTC
Updated2026-09-21 19:17:15 UTC
DescriptionWarpgate 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.

Risk And Classification

Primary CVSS: v3.1 5.7 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N

EPSS: 0.001720000 probability, percentile 0.069250000 (date 2026-09-22)

Problem Types: CWE-297 | CWE-923 | CWE-297 CWE-297: Improper Validation of Certificate with Host Mismatch | CWE-923 CWE-923: Improper Restriction of Communication Channel to Intended Endpoints

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.7MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N
3.1CNADECLARED5.7MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Warp-tech Warpgate affected >= 0.25.0, < 0.27.6 Not specified

References

ReferenceSourceLinkTags
github.com/warp-tech/warpgate/security/advisories/GHSA-w9jj-vpw3-5r8f [email protected] github.com
github.com/warp-tech/warpgate/releases/tag/v0.27.6 [email protected] github.com
github.com/warp-tech/warpgate/commit/fb66ff74f979c22054f4d348cc0d9065cc6... [email protected] github.com
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