CVE-2026-45673

MEDIUM6.8

Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port

Published Jun 12, 2026

Modified 1 weeks ago

Details

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final patch the issue.

References

WEB

https://github.com/netty/netty/releases/tag/netty-4.1.135.Final

WEB

https://github.com/netty/netty/releases/tag/netty-4.2.15.Final

WEB

https://github.com/netty/netty/security/advisories/GHSA-xmv7-r254-6q78

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-45673

CVSS Analysis

CVSS v3.1

6.8