CVE-2026-45673: Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port

June 8, 2026 (updated June 12, 2026)

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).

References

github.com/advisories/GHSA-xmv7-r254-6q78
github.com/netty/netty/releases/tag/netty-4.1.135.Final
github.com/netty/netty/releases/tag/netty-4.2.15.Final
github.com/netty/netty/security/advisories/GHSA-xmv7-r254-6q78
nvd.nist.gov/vuln/detail/CVE-2026-45673

Code Behaviors & Features

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