CVE-2025-29908: Netty Netty-Incubator-Codec-Quic

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

Netty QUIC codec is a QUIC codec for netty which makes use of quiche. An issue was discovered in the codec. A hash collision vulnerability (in the hash map used to manage connections) allows remote attackers to cause a considerable CPU load on the server (a Hash DoS attack) by initiating connections with colliding Source Connection IDs (SCIDs). This vulnerability is fixed in 0.0.71.Final.

Affected products

• Netty Netty-Incubator-Codec-Quic: before 0.0.71.Final (fixed in 0.0.71.Final)

Published 2025-03-31. Last modified 2026-06-17.