CVE-2026-51994 Server-side request forgery in n/a
An attacker can exploit SSRF in mcp-remote by manipulating the resource_metadata URL in a remote MCP server's WWW-Authenticate header.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-51994?
CVE-2026-51994 is a critical server-side request forgery vulnerability in n/a, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
mcp-remote versions 0.1.32 through 0.1.38 are vulnerable to Server-Side Request Forgery (SSRF) via the resource_metadata URL extracted from a remote MCP server's WWW-Authenticate header
Weakness: CWE-918
Which versions are affected by CVE-2026-51994?
How do I fix CVE-2026-51994?
No fix has been published for CVE-2026-51994 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-51994 being exploited?
There is no known exploitation of CVE-2026-51994 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-8rrr-xx35-4q6h.