Quarkus HTTP Auth Bypass via Encoded ; and / Fixed 3.37.0
CVE-2026-50559 Published on June 19, 2026
Authentication/Authorization Bypass via Advanced Path Normalization Vulnerabilities
Quarkus is a Java framework for building cloud-native applications. Prior to versions 3.37.0, 3.36.3, 3.33.2.1, 3.33.3, 3.27.4.1, 3.27.5, and 3.20.6.2, Quarkus HTTP path-based authorization policies can be bypassed using encoded semicolons (%3B) to smuggle matrix parameters past the security layer, and using encoded slashes (%2F) or backslashes (%5C) to access protected static resources. This is a distinct issue from CVE-2026-39852, which addressed only literal semicolon stripping. Versions 3.37.0, 3.36.3, 3.33.2.1, 3.33.3, 3.27.4.1, 3.27.5, and 3.20.6.2 contain a patch.
Vulnerability Analysis
CVE-2026-50559 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Types
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2026-50559 has been classified to as an authentification vulnerability or weakness.
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-50559 has been classified to as an AuthZ vulnerability or weakness.
Affected Versions
quarkusio quarkus:- Version >= 3.36.0, < 3.36.3 is affected.
- Version >= 3.33.0, < 3.33.2.1 is affected.
- Version >= 3.27.0, < 3.27.4.1 is affected.
- Version < 3.20.6.2 is affected.