--- cve: "CVE-2026-73553" severity: "HIGH" cvss: 7.5 epss: "0.5%" vendor: "envoyproxy" kev: false exploited: false published: "2026-09-21 21:17:09" tags: [cve, security, high] source: tsecurity.de CVE-Dossier exported: "2026-09-23T16:38:46+02:00" --- # CVE-2026-73553 > 7.5 HIGH · 🧪 PoC ## Beschreibung 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-Vektor ``` CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N ``` | Metrik | Wert | Bewertung | |---|---|---| | AV Angriffsvektor | Netzwerk | bad | | AC Komplexität | Hoch | good | | PR Privilegien | Keine | bad | | UI Interaktion | Keine | bad | | S Scope | Verändert | bad | | C Vertraulichkeit | Hoch | bad | | I Integrität | Gering | warn | | A Verfügbarkeit | Keine | good | ## Patch verfügbar (OSV) - 053a8989382dd91542ecf0cef8f379b9cb761cdd (Commit) - cf413bdb37b36d3ffbe570b8a48760abe2b588f5 (Commit) ## Referenzen - - - - - - - - - --- _Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73553) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_