Web Application Vulnerabilities Runtime SCA Findings
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Envoy : Use of Non-Canonical URL Paths for Authorization Decisions Vulnerability - CVE-2026-73551 - Vulnerability Database
Envoy Proxy

Envoy : Use of Non-Canonical URL Paths for Authorization Decisions Vulnerability - CVE-2026-73551

Medium
Reference: CVE-2026-73551
NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2026-73551
Title: Envoy : Use of Non-Canonical URL Paths for Authorization Decisions Vulnerability
Overview:

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 Envoys URL normalization does not recognize dot and dotdot path segments when they carry semicolon parameters. A request such as /user/..foobar/admin is therefore not canonicalized to /admin even when path normalization is enabled. If an upstream interprets the segment according to RFC 3986 while Envoy applies routing or RBAC to the uncollapsed path a remote cl