Netty QUIC hash collision DoS attack
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).
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | io.netty.incubator:netty-incubator-codec-quic | < 0.0.71.Final | 0.0.71.Final |
References
- https://github.com/netty/netty-incubator-codec-quic/security/advisories/GHSA-hqqc-jr88-p6x2
- https://nvd.nist.gov/vuln/detail/CVE-2025-29908
- https://github.com/netty/netty-incubator-codec-quic/commit/e059bd9b78723f8b035e0c547e42ce263f03461c
- https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory
- https://github.com/netty/netty-incubator-codec-quic
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L- Weakness (CWE)
CWE-407- Platform
- Java / Kotlin (Maven)
- Package
io.netty.incubator:netty-incubator-codec-quic- Disclosed
- 31.03.2025
- Updated
- 11.10.2026 12:21
Sources and licenses
OSV / GitHub Advisory Database - GHSA-hqqc-jr88-p6x2 - CC BY 4.0
Vulnerability history: io.netty.incubator:netty-incubator-codec-quic
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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