Fluid Attacks Database

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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
debian 12	netty	=1:4.1.48-10 \|\| =1:4.1.48-11 \|\| =1:4.1.48-12 \|\| =1:4.1.48-13 \|\| =1:4.1.48-14 \|\| =1:4.1.48-15 \|\| =1:4.1.48-16 \|\| =1:4.1.48-7 \|\| =1:4.1.48-7+deb12u1 \|\| =1:4.1.48-7+deb12u2 \|\| =1:4.1.48-8 \|\| =1:4.1.48-9	-
debian 14	netty	=1:4.1.48-10 \|\| =1:4.1.48-11 \|\| =1:4.1.48-12 \|\| =1:4.1.48-13 \|\| =1:4.1.48-14 \|\| =1:4.1.48-15 \|\| =1:4.1.48-16	-
maven	io.netty:netty-resolver-dns	>=4.2.0.final <4.2.15.final \|\| >=0 <4.1.135.final	4.2.15.final, 4.1.135.final
debian 13	netty	=1:4.1.48-10 \|\| =1:4.1.48-10+deb13u1 \|\| =1:4.1.48-11 \|\| =1:4.1.48-12 \|\| =1:4.1.48-13 \|\| =1:4.1.48-14 \|\| =1:4.1.48-15 \|\| =1:4.1.48-16	-

Aliases

1. CVE-2026-456732. NVD-2026-456733. OSV-DEBIAN-2026-456734. OSV-2026-456735. GHSA-xmv7-r254-6q786. GCVE-2026-456737. SECURITY-TRACKER-CVE-2026-45673

References

1. https://github.com/netty/netty/security/advisories/GHSA-xmv7-r254-6q782. https://github.com/netty/netty/releases/tag/netty-4.1.135.Final3. https://github.com/netty/netty/releases/tag/netty-4.2.15.Final

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