CVE-2026-39852 — Quarkus authorization bypass via semicolon path normalization inconsistency

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
quarkusio / quarkus	affected < 3.20.6.1; affected >= 3.27.3.0, < 3.27.3.1; affected >= 3.34.0, < 3.34.7; affected >= 3.35.0, < 3.35.2

CWE

CWE-863

References

https://github.com/quarkusio/quarkus/security/advisories/GHSA-rc95-pcm8-65v9

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in io.quarkus:quarkus-vertx-http. A remote attacker can exploit an authorization bypass vulnerability by including semicolons, also known as matrix parameters, in HTTP requests. This allows bypassing path-based HTTP security policies, enabling unauthorized access to protected endpoints. The vulnerability arises because Quarkus's security layer performs authorization checks on the raw URL path, which preserves these matrix parameters.