CVE-2026-39852

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.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39852.json

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

https://bugzilla.redhat.com/show_bug.cgi?id=2457819

https://access.redhat.com/security/cve/CVE-2026-39852

https://access.redhat.com/errata/RHSA-2026:34608

https://access.redhat.com/errata/RHSA-2026:25089

https://access.redhat.com/errata/RHSA-2026:17789

https://access.redhat.com/errata/RHSA-2026:13631

https://access.redhat.com/errata/RHSA-2026:11721

https://access.redhat.com/errata/RHSA-2026:11720

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS