Quarkus CVE-2026-39852

Quarkus version 3.32.4 is vulnerable to an authorization bypass issue (GHSL-2026-099), in which semicolons (matrix parameters) in HTTP requests can be used to bypass security constraints, potentially allowing unauthorized access to protected resources.

Unauthenticated or lower-privileged users can bypass HTTP path-based authorization policies by appending a semicolon (;) and arbitrary text to the request URL. The vulnerability arises from a path-normalization inconsistency: Quarkus's security layer performs authorization checks on the raw URL path (which preserves matrix parameters), whereas RESTEasy Reactive's routing layer strips matrix parameters before matching endpoints. This allows requests like /api/admin;anything to bypass policies protecting /api/admin while still routing to the protected endpoint.

Impact

This issue may lead to Authentication/Authorization bypasses.

Credits

This issue was discovered with the GitHub Security Lab Taskflow Agent and manually verified by GHSL team members @p- (Peter Stöckli) and @m-y-mo (Man Yue Mo).