CVE-2026-39852
Analyzed Analyzed - Analysis Complete
Path Normalization Bypass in Quarkus Framework

Publication date: 2026-05-05

Last updated on: 2026-05-08

Assigner: GitHub, Inc.

Description
Quarkus is a Java framework for building cloud-native applications. In versions prior to 3.20.6.1, 3.27.3.1, 3.33.1.1, 3.35.1.1, 3.34.7, and 3.35.2, a path normalization inconsistency between the security layer and the routing layer allows unauthenticated or lower-privileged users to bypass HTTP path-based authorization policies. Quarkus's security layer performs authorization checks on the raw URL path which preserves matrix parameters (semicolons), while RESTEasy Reactive's routing layer strips matrix parameters before matching endpoints. An attacker can append a semicolon and arbitrary text to a request URL (e.g., /api/admin;anything) to bypass policies protecting /api/admin while still routing to the protected endpoint. This issue has been fixed in versions 3.20.6.1, 3.27.3.1, 3.33.1.1, 3.35.1.1, 3.34.7, and 3.35.2.
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Meta Information
Published
2026-05-05
Last Modified
2026-05-08
Generated
2026-06-16
AI Q&A
2026-05-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-39852
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
quarkus quarkus to 3.20.6.1 (exc)
quarkus quarkus From 3.21.0 (inc) to 3.27.3.1 (exc)
quarkus quarkus From 3.28.0 (inc) to 3.33.1.1 (exc)
quarkus quarkus From 3.34.0 (inc) to 3.34.7 (exc)
quarkus quarkus From 3.35.0 (inc) to 3.35.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
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Executive Summary

This vulnerability exists in the Quarkus Java framework versions prior to 3.20.6.1, 3.27.3.1, 3.33.1.1, 3.35.1.1, 3.34.7, and 3.35.2. It is caused by a path normalization inconsistency between the security layer and the routing layer.

Specifically, the security layer performs authorization checks on the raw URL path, which includes matrix parameters (semicolons), while the routing layer strips these matrix parameters before matching endpoints.

An attacker can exploit this by appending a semicolon and arbitrary text to a request URL (for example, /api/admin;anything). This allows them to bypass HTTP path-based authorization policies protecting endpoints like /api/admin, while still routing to the protected endpoint.

This means unauthorized or lower-privileged users can access restricted resources by manipulating the URL path.

Impact Analysis

This vulnerability can allow unauthenticated or lower-privileged users to bypass authorization controls and access protected endpoints within a Quarkus-based application.

As a result, sensitive data or administrative functions that should be restricted could be exposed to unauthorized users.

This can lead to unauthorized data access, potential data leakage, and compromise of application integrity and security.

Mitigation Strategies

To mitigate this vulnerability, upgrade Quarkus to one of the fixed versions: 3.20.6.1, 3.27.3.1, 3.33.1.1, 3.35.1.1, 3.34.7, or 3.35.2.

Compliance Impact

The vulnerability allows unauthorized or lower-privileged users to bypass HTTP path-based authorization policies, potentially granting access to protected endpoints without proper authorization.

Such unauthorized access could lead to exposure or manipulation of sensitive data, which may impact compliance with standards and regulations like GDPR and HIPAA that require strict access controls and protection of personal or health information.

However, the provided information does not explicitly discuss compliance implications or specific regulatory impacts.

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