CVE-2026-39852
Description
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.
Mitigation
To mitigate this issue, configure a reverse proxy or load balancer in front of the Quarkus application to normalize incoming URL paths by stripping matrix parameters (semicolons) before requests reach the Quarkus security layer. This ensures that authorization checks are performed on the intended path. Ensure that any changes to proxy configurations are thoroughly tested and services are reloaded or restarted as necessary to apply the new settings.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.2 | 8.2 | 8.2 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | High | None |
| Integrity Impact | Low | Low | Low |
| Availability Impact | High | None | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Frequently Asked Questions
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