CVE-2026-51994 mcp-remote - Server-Side Request Forgery

mcp-remote 0.1.32 through 0.1.38 contains a server-side request forgery caused by processing the resource_metadata URL from a remote MCP server's WWW-Authenticate header, letting attackers make arbitrary server requests, exploit requires crafted header from remote server.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
EPSS
0.35% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Server-Side Request Forgery
Impact
Server Side Request Forgery
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
24 September 2026
Updated
15 October 2026
Weakness
CWE-918

Vendor fix

Update to a version later than 0.1.38 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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