Incorrect Authorization Affecting io.quarkus:quarkus-undertow package, versions [,3.20.6.1)[3.21.0,3.27.3.1)[3.28.0,3.33.1.1)[3.34.0.CR1,3.34.7)[3.35.0.CR1,3.35.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-IOQUARKUS-16420253
- published5 May 2026
- disclosed4 May 2026
- creditPeter Stöckli, Man Yue Mo
Introduced: 4 May 2026
CVE-2026-39852 (opens in a new tab)How to fix?
Upgrade io.quarkus:quarkus-undertow to version 3.20.6.1, 3.27.3.1, 3.33.1.1, 3.34.7, 3.35.1 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Authorization when handling HTTP request paths that have had normalizedPath() applied. An attacker can gain unauthorized access to protected resources by appending a semicolon and arbitrary text to the request URL, exploiting inconsistencies between the security layer and routing layer in path normalization. Endpoints are matched for authorization purposes with their trailing matrix parameters, so /api/admin;anything successfully matches /api/admin, but routing rules are applied to the endpoint without matrix parameters, bypassing policies.