Incorrect Authorization Affecting io.netty:netty-codec-http package, versions [4.1.0.Final,4.1.136.Final)[4.2.0.Final,4.2.16.Final)
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-IONETTY-18170206
- published22 Jul 2026
- disclosed21 Jul 2026
- creditVioleta Georgieva
Introduced: 21 Jul 2026
NewCVE-2026-56746 (opens in a new tab)How to fix?
Upgrade io.netty:netty-codec-http to version 4.1.136.Final, 4.2.16.Final or higher.
Overview
io.netty:netty-codec-http is a network application framework for rapid development of maintainable high performance protocol servers & clients.
Affected versions of this package are vulnerable to Incorrect Authorization in the CorsHandler. An attacker can gain unauthorized access to backend resources by sending requests with an Origin: null header, which bypasses the intended access controls due to a logical operator error in the origin evaluation.