---
id: CVE-2026-91166
title: 'Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux'
summary: >-
  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 pas…
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-297
  - CWE-923
vendor: warp-tech
product: warpgate
affected:
  - 'warpgate >= 0.25.0, < 0.27.6'
published: '2026-09-21'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T23:19:21.613'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91166'
references:
  - url: >-
      https://github.com/warp-tech/warpgate/commit/fb66ff74f979c22054f4d348cc0d9065cc67e5d3
    label: security-advisories@github.com
  - url: 'https://github.com/warp-tech/warpgate/releases/tag/v0.27.6'
    label: security-advisories@github.com
  - url: >-
      https://github.com/warp-tech/warpgate/security/advisories/GHSA-w9jj-vpw3-5r8f
    label: security-advisories@github.com
  - url: >-
      https://github.com/warp-tech/warpgate/security/advisories/GHSA-w9jj-vpw3-5r8f
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-24T22:31:49.029825Z'
epss: 0.00218
epssPercentile: 0.10861
ingestedAt: '2026-09-21T19:51:58.863Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.