Medium 6.8Published Jun 12, 2026

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

Updated under an hour ago (Oct 26, 2026, 1:23 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Weakness (CWE): CWE-330, CWE-340
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jun 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

netty netty netty:netty (from the name)	from 4.2.0.Final, < 4.2.15.Final; before 4.1.135.Final	CNA record
netty netty netty:netty	before 4.1.135; from 4.2.0 before 4.2.15	NVD

References

https://github.com/netty/netty/security/advisories/GHSA-xmv7-r254-6q78x-refsource-confirm, vendor-advisory
https://github.com/netty/netty/releases/tag/netty-4.1.135.Finalx-refsource-misc, release-notes
https://github.com/netty/netty/releases/tag/netty-4.2.15.Finalx-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.