CVE-2026-37236
Critical · 9.8CVSS
9.8
EPSS
0.4%
Published
Aug 28, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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