CVE-2026-37236

CriticalCVSS 9.8/10Last modified Sep 8, 2026

Description

grpc-gateway v2.28.0 is vulnerable to Incorrect Access Control. The application processes the X-HTTP-Method-Override header in ServeMux.ServeHTTP without restricting allowed methods. When a POST request with Content-Type application/x-www-form-urlencoded includes this header, the request method is rewritten to an arbitrary attacker-supplied value before routing. This allows bypassing method-based access controls enforced by upstream proxies or WAFs.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-639

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

Timeline

Published: Aug 28, 2026
Last modified: Sep 8, 2026
NVD status: Deferred

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