CVE-2026-73553

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 3.1

7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

EPSS

0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-25)

CWE

CWE-436

Published

2026-09-21

Modified

2026-10-05

Record from

the NVD, synced 2026-10-19

Affected

• envoyproxy:envoy

References

• https://github.com/envoyproxy/envoy/commit/0be4a0302ea94a894e470817c2edfbd5ed90d273
• https://github.com/envoyproxy/envoy/commit/6a703a375a20e3bf98140ee5f5522c614adee7b6
• https://github.com/envoyproxy/envoy/commit/b6ec9b66cc33a415e2fa81a6fa8363cac4772dd1
• https://github.com/envoyproxy/envoy/commit/e6d5fe885409ebb335ed3934a167f0bcfea471f2
• https://github.com/envoyproxy/envoy/releases/tag/v1.36.10

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