CVE-2026-50559 Authentication/Authorization Bypass via Advanced Path Normalization Vulnerabilities
Attackers can bypass HTTP path-based authorization policies in Quarkus by using encoded characters to access protected resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-50559?
CVE-2026-50559 is a high-severity authentication bypass vulnerability in quarkusio quarkus, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Quarkus is a Java framework for building cloud-native applications. Prior to versions 3.37.0, 3.36.3, 3.33.2.1, 3.33.3, 3.27.4.1, 3.27.5, and 3.20.6.2, Quarkus HTTP path-based authorization policies can be bypassed using encoded semicolons (%3B) to smuggle matrix parameters past the security layer, and using encoded slashes (%2F) or backslashes (%5C) to access protected static resources. This is a distinct issue from CVE-2026-39852, which addressed only literal semicolon stripping. Versions 3.37.0, 3.36.3, 3.33.2.1, 3.33.3, 3.27.4.1, 3.27.5, and 3.20.6.2 contain a patch.
Which versions are affected by CVE-2026-50559?
10 open source packages ship an affected version, including io.quarkus:quarkus-vertx-http. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
io.quarkus:quarkus-vertx-http Maven | All versions | 3.20.6.2 |
io.quarkus:quarkus-vertx-http Maven | All versions | 3.20.6.2 |
io.quarkus:quarkus-vertx-http Maven | From 3.21.0.CR1 | 3.27.4.1 |
io.quarkus:quarkus-vertx-http Maven | From 3.21.0.CR1 | 3.27.4.1 |
io.quarkus:quarkus-vertx-http Maven | From 3.28.0.CR1 | 3.33.2.1 |
io.quarkus:quarkus-vertx-http Maven | From 3.28.0.CR1 | 3.33.2.1 |
4 more packages
io.quarkus:quarkus-vertx-http Maven | From 3.34.0.CR1 | 3.36.3 |
io.quarkus:quarkus-vertx-http Maven | From 3.34.0.CR1 | 3.36.3 |
io.quarkus:quarkus-vertx-http Maven | From 3.37.0.CR1 | 3.37.0 |
io.quarkus:quarkus-vertx-http Maven | From 3.37.0.CR1 | 3.37.0 |
Products include Quarkus Quarkus.
How do I fix CVE-2026-50559?
Upgrade io.quarkus:quarkus-vertx-http to a fixed version for your release line: 3.20.6.2, 3.27.4.1, 3.33.2.1 or 3.36.3.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-50559 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50559 exists.
Other vulnerabilities in quarkusio quarkus
- CVE-2022-4116 Code injection in quarkus dev ui config editor
- CVE-2022-2466 Quarkus does not terminate HTTP requests header context
- CVE-2024-12225 Io.quarkus:quarkus-security-webauthn: quarkus webauthn unexpected authentication bypass
- CVE-2026-39852 Quarkus authorization bypass via semicolon path normalization inconsistency
- CVE-2022-0981 Privilege escalation in quarkus
Sources
Also known as CLEANSTART-2026-LK75271, CLEANSTART-2026-YM07192, ECHO-0e94-4675-6cee, GHSA-qcxp-gm7m-4j5v, MINI-25q9-3gcq-mp9w, MINI-35jv-hh55-vh33 and 6 more.