Vulnerability Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, When ignore_path_parameters_in_path_matching is enabled, Envoy's router strips the semicolon suffix before matching but the RBAC url_path matcher evaluates the raw path. A downstream request such as /admin;x can therefore miss a DENY rule for /admin while the router still selects the protected /admin backend. The inconsistent canonicalization allows an unauthenticated client to bypass path-based authorization. The relevant scope boundary is that the route option and a path-based RBAC rule must both be present, and the protected route must match after stripping. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Envoyproxy | Envoy | < 1.36.10 |
Related Weaknesses (CWE)
References
- https://github.com/envoyproxy/envoy/commit/0be4a0302ea94a894e470817c2edfbd5ed90dPatch
- https://github.com/envoyproxy/envoy/commit/6a703a375a20e3bf98140ee5f5522c614adeePatch
- https://github.com/envoyproxy/envoy/commit/b6ec9b66cc33a415e2fa81a6fa8363cac4772Patch
- https://github.com/envoyproxy/envoy/commit/e6d5fe885409ebb335ed3934a167f0bcfea47Patch
- https://github.com/envoyproxy/envoy/releases/tag/v1.36.10Release Notes
- https://github.com/envoyproxy/envoy/releases/tag/v1.37.6Release Notes
- https://github.com/envoyproxy/envoy/releases/tag/v1.38.4Release Notes
- https://github.com/envoyproxy/envoy/releases/tag/v1.39.1Release Notes
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-77x5-xqjg-hprqExploitVendor AdvisoryMitigation
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-77x5-xqjg-hprqExploitVendor AdvisoryMitigation
FAQ
What is CVE-2026-73553?
CVE-2026-73553 is a vulnerability with a CVSS score of 7.5 (HIGH). Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, When ignore_path_parameters_in_path_matching is enabled, Envoy's ro...
How severe is CVE-2026-73553?
CVE-2026-73553 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-73553?
Check the references section above for vendor advisories and patch information. Affected products include: Envoyproxy Envoy.