What’s Vulnerable › Vulnerabilities

CVE-2026-91166: Warpgate: Web SSH stores a jump host's key against the target's address, so it validates as the target

• Severity: medium (CVSS 5.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-24
• Weakness: CWE-297

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.

Affected products

• warp-tech warpgate: from 0.25.0, < 0.27.6

References

• 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

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