CVE-2026-45673 | THREATINT

Description

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.

PUBLISHED Reserved 2026-05-12 | Published 2026-06-12 | Updated 2026-06-12 | Assigner GitHub_M

MEDIUM: 6.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

Problem types

CWE-330: Use of Insufficiently Random Values

CWE-340: Generation of Predictable Numbers or Identifiers

Product status

>= 4.2.0.Final, < 4.2.15.Final

affected

< 4.1.135.Final

affected

References

github.com/.../netty/security/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

cve.org (CVE-2026-45673)

nvd.nist.gov (CVE-2026-45673)

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