grpc-gateway v2.28.0 is vulnerable to Incorrect Access Control.
Priority MEDIUM 49CWE-639Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 2 fixed, 12 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-639.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00434 37th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 2 fixed, 12 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
Red Hat 2 advisories
- RHSA-2026:95610 Released 2026-11-05 · Red Hat rating ModerateImportant: Red Hat OpenShift GitOps v1.20.11 security update
- Red Hat OpenShift GitOps 1.20 registry.redhat.io/openshift-gitops-1/argocd-rhel9
- RHSA-2026:92307 Released 2026-10-29 · Red Hat rating ImportantRed Hat Advanced Cluster Management for Kubernetes v2.13.14 security update
- Red Hat Advanced Cluster Management for Kubernetes 2.13 registry.redhat.io/rhacm2/acm-grafana-rhel9, registry.redhat.io/rhacm2/acm-multicluster-observability-addon-rhel9, registry.redhat.io/rhacm2/acm-prometheus-config-reloader-rhel9 +16
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Multicluster Global Hub | Affected | No fix yet |
| OpenShift Serverless | Affected | No fix yet |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet |
| Red Hat Ceph Storage 5 | Affected | No fix yet: Fix deferred |
| Red Hat Ceph Storage 6 | Affected | No fix yet: Fix deferred |
| Red Hat Ceph Storage 7 | Affected | No fix yet: Fix deferred |
| Red Hat Ceph Storage 8 | Affected | No fix yet: Fix deferred |
| Red Hat Ceph Storage 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
| Red Hat OpenShift GitOps | Affected | No fix planned: Will not fix |
| Red Hat Advanced Cluster Management for Kubernetes 2.13 | Fixed | RHSA-2026:92307 |
| Red Hat OpenShift GitOps 1.20 | Fixed | RHSA-2026:95610 |
Not affected: 15 products
- Cryostat 4
- Migration Toolkit for Applications 8
- Red Hat Advanced Cluster Management for Kubernetes 2
- Red Hat Advanced Cluster Management for Kubernetes 2.13
- Red Hat Ansible Automation Platform 2
- Red Hat Enterprise Linux 8
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 5
- Red Hat OpenShift GitOps
- Red Hat OpenShift GitOps 1.20
- Red Hat OpenShift Virtualization 4
- Red Hat OpenStack Platform 16.2
- Red Hat OpenStack Platform 17.1
- Red Hat OpenStack Platform 18.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-37236
- 2026-10-03 Alias added: GHSA-6gx8-r37x-4vw8
- 2026-10-10 Affected versions changed · Red Hat
- 2026-10-18 Affected versions changed · Red Hat
- 2026-10-30 Fix available: RHSA-2026:92307 · Red Hat
- 2026-10-30 Fix available: Red Hat Advanced Cluster Management for Kubernetes 2.13 · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
- 2026-11-06 Fix available: Red Hat OpenShift GitOps 1.20 · Red Hat
- 2026-11-06 Fix available: RHSA-2026:95610 · Red Hat
References
Sources
- CVE-2026-37236 · CVE Program
- CVE-2026-37236 · NVD
- FIRST EPSS
- GHSA-6gx8-r37x-4vw8 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-37236 · Red Hat security data · CC BY 4.0
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