CVE-2026-37236

9.8 criticalEPSS 0.4%

Critical (9.8). EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 37% of CVEs (scores of 2026-10-31)
CWE: CWE-639
Published: 2026-08-28
Modified: 2026-09-08
Record from: the NVD, synced 2026-10-19

References

https://github.com/grpc-ecosystem/grpc-gateway
https://github.com/grpc-ecosystem/grpc-gateway/commit/72123cd4f32545f6e1376873f412dcdcbcf29acc
https://s00me00ne.com/cve/cve-2026-37236/

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