Critical
golang-github-grpc-ecosystem-grpc-gateway — security advisory
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.
- Products
- golang-github-grpc-ecosystem-grpc-gateway
- Affected versions
- 1.1.0+git20170127.54.6863684-1, 1.16.0-3build1, 1.16.0-4, 1.16.0-4ubuntu0.24.04.1, 1.16.0-4ubuntu0.24.04.2, 1.16.0-4ubuntu0.24.04.3, 1.2.2-1, 1.3.0-1, 1.6.4-2, 1.6.4-2build2, 2.20.0-2, 2.20.0-2build1, 2.27.2-1, 2.27.2-3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-37236
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:01 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-37236
golang-github-grpc-ecosystem-grpc-gateway
Fixed versions: Not specified
golang-github-grpc-ecosystem-grpc-gateway
Fixed versions: Not specified
golang-github-grpc-ecosystem-grpc-gateway
Fixed versions: Not specified
golang-github-grpc-ecosystem-grpc-gateway
Fixed versions: Not specified
golang-github-grpc-ecosystem-grpc-gateway
Fixed versions: Not specified
golang-github-grpc-ecosystem-grpc-gateway
Fixed versions: Not specified
Complete source record
{
"id": "370292d65fce0d0781322506858051531ea2eb1388d4165422281ac40bcf5e97",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-37236",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-37236",
"summary": "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.",
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"ecosystem": "Ubuntu:18.04:LTS"
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"purl": "pkg:deb/ubuntu/golang-github-grpc-ecosystem-grpc-gateway?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
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"modified": "2026-10-17T13:00:02.585938369Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-37236",
"https://www.cve.org/CVERecord?id=CVE-2026-37236",
"https://github.com/grpc-ecosystem/grpc-gateway/commit/72123cd4f32545f6e1376873f412dcdcbcf29acc",
"https://github.com/grpc-ecosystem/grpc-gateway",
"https://s00me00ne.com/cve/cve-2026-37236/"
]
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"evidence": "/upstream"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
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"source_id": "core-osv",
"document_id": 360176,
"published_at": "2026-08-28T16:17:00+00:00"
}