Insecure Randomness Affecting io.netty:netty-codec-classes-quic package, versions [4.2.0.Alpha1,4.2.15.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-17337011
- published14 Jun 2026
- disclosed12 Jun 2026
- creditVioleta Georgieva
Introduced: 12 Jun 2026
NewCVE-2026-50009 (opens in a new tab)How to fix?
Upgrade io.netty:netty-codec-classes-quic to version 4.2.15.Final or higher.
Overview
Affected versions of this package are vulnerable to Insecure Randomness in the form of generating stateless reset-tokens based on HMAC connection ID. An attacker in a MitM position can deduce token material by observing QUIC headers after a source CID rotation, and can cause service disruption by sending spoofed stateless reset packets.