CVE-2026-63329 Auth bypass in warpgate
An authenticated attacker can spoof their identity by injecting reserved headers, allowing them to access backend services as another user.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63329?
CVE-2026-63329 is a medium-severity authentication bypass vulnerability in warp-tech warpgate, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. Prior to 0.25.6, copy_server_request in warpgate-protocol-http/src/proxy.rs forwards a client-supplied x-warpgate-username header before inject_own_headers appends the authenticated username. Because the request builder preserves repeated values, a proxied backend that trusts the first x-warpgate-username value can authorize an authenticated attacker as another user. The same forwarding policy also accepts the reserved x-warpgate-authentication-type header, and warpgate-common/src/http_headers.rs does not exclude either reserved identity header. This issue is fixed in version 0.25.6.
Which versions are affected by CVE-2026-63329?
How do I fix CVE-2026-63329?
No fix has been published for CVE-2026-63329 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-63329 being exploited?
There is no known exploitation of CVE-2026-63329 in the wild and no public exploit code.
Sources
Also known as GHSA-862h-v6cc-9757.