# CVE-2026-37236: 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.

CVE-2026-37236 is fixed in 7 products on 1 platform, first by DEBIAN-CVE-2026-37236, released September 2, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-37236
- Priority: High
- CVSS: 9.8 (Moderate)
- EPSS: 0.0043
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 28, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-37236

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | alloy opensuse-leap 16.0 | 1.19.2-160000.1.1 | [OPENSUSE-SU-2026:22032-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22032-1.md) | Oct 6, 2026 |
| Linux | alloy sles 15.7 | 1.19.2-150700.15.29.1 | [SUSE-SU-2026:4408-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4408-1.md) | Oct 1, 2026 |
| Linux | alloy sles 16.0 | 1.19.2-160000.1.1 | [SUSE-SU-2026:24148-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24148-1.md) | Oct 6, 2026 |
| Linux | amazon-cloudwatch-agent sles 15.6 | 1.300069.0-150400.9.10.1 | [SUSE-SU-2026:4045-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4045-1.md) | Sep 7, 2026 |
| Linux | amazon-cloudwatch-agent sles 15.7 | 1.300069.0-150400.9.10.1 | [SUSE-SU-2026:4045-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4045-1.md) | Sep 7, 2026 |
| Linux | distribution opensuse-leap 16.0 | 3.1.1-160000.3.1 | [OPENSUSE-SU-2026:21898-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21898-1.md) | Sep 21, 2026 |
| Linux | distribution sles 16.0 | 3.1.1-160000.3.1 | [SUSE-SU-2026:23864-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23864-1.md) | Sep 21, 2026 |
| Linux | golang-github-grpc-ecosystem-grpc-gateway Debian 14 | 2.30.0-1 | [DEBIAN-CVE-2026-37236](https://patchblox.com/security/data/fix/linux/debian-cve-2026-37236.md) | Sep 2, 2026 |
| Linux | hauler opensuse-leap 16.0 | 2.1.0-bp160.1.1 | [OPENSUSE-SU-2026:21793-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21793-1.md) | Sep 3, 2026 |
| Linux | helm opensuse-leap 16.0 | 3.21.3-160000.2.1 | [OPENSUSE-SU-2026:21809-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21809-1.md) | Sep 8, 2026 |
| Linux | helm sles 15.6 | 3.21.3-150000.1.96.1 | [SUSE-SU-2026:4175-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4175-1.md) | Sep 14, 2026 |
| Linux | helm sles 15.7 | 3.21.3-150000.1.96.1 | [SUSE-SU-2026:4175-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4175-1.md) | Sep 14, 2026 |
| Linux | helm sles 16.0 | 3.21.3-160000.2.1 | [SUSE-SU-2026:23688-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23688-1.md) | Sep 8, 2026 |
| Linux | trivy opensuse-leap 16.0 | 0.74.0-160000.2.1 | [OPENSUSE-SU-2026:21801-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21801-1.md) | Sep 7, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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