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CVE-2026-39852 is an authorization bypass vulnerability in Quarkus, affecting io.quarkus:quarkus-vertx-http before versions 3.20.6.1, 3.27.3.1, 3.33.1.1, 3.35.1.1, 3.34.7, and 3.35.2. The flaw is caused by inconsistent path normalization between Quarkus's security layer and the RESTEasy Reactive routing layer. The security layer evaluates authorization policies against the raw request path, where matrix parameters introduced with semicolons are preserved, while the routing layer strips those matrix parameters before endpoint matching. As a result, a request path modified by appending a semicolon and trailing text can evade HTTP path-based authorization checks while still being routed to the protected endpoint. This creates a mismatch between the path that is authorized and the path that is ultimately executed.
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A separate Quarkus vulnerability mentioned for comparison, whose remediation addressed only literal semicolon stripping rather than the encoded-character authorization bypass described in the main advisory.
A vulnerability published on May 4, 2026. The supplied CVSS vectors describe network-based exploitation with low complexity, no required privileges or user interaction, high confidentiality impact, low integrity impact, and no availability impact. The affected product and technical flaw are not identified. A patch publication date of September 28, 2026 is listed.
An authorization bypass vulnerability in quarkus-vertx-http via semicolons in HTTP requests.
A Quarkus Vert.x HTTP vulnerability allowing authorization bypass via semicolons in HTTP requests.
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Cross-references every affected SKU, including bundled OEM variants.
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