CVE-2026-45673
MEDIUMNetty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port
Title source: cnaDescription
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 (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/netty/netty/security/advisories/GHSA-xmv7-r254-6q78
X_Refsource_Misc x_refsource_misc
https://github.com/netty/netty/releases/tag/netty-4.1.135.Final
X_Refsource_Misc x_refsource_misc
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
Scores
CVSS v3
6.8
EPSS
0.0040
EPSS Percentile
31.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-330
CWE-340
Status
published
Products (5)
io.netty/netty-resolver-dns
0 - 4.1.135.FinalMaven
io.netty/netty-resolver-dns
4.2.0.Final - 4.2.15.FinalMaven
netty/netty
< 4.1.135
netty/netty
< 4.1.135.Final
netty/netty
>= 4.2.0.Final, < 4.2.15.Final
Published
Jun 12, 2026
Tracked Since
Jun 12, 2026