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Vulnerability record · CVE-2026-45673 · published 12 June 2026

CVE-2026-45673: Netty vulnerability

Netty · Netty

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.

6.8 CVSS 3.1 Medium EPSS 0.40% · top 67.5% CWE-330 · CWE-330CWE-340 · CWE-340
6.8CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/netty/netty/releases/tag/netty-4.1.135.Final Release Notes
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final Release Notes
https://github.com/netty/netty/security/advisories/GHSA-xmv7-r254-6q78 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-45673), CISA KEV, FIRST EPSS (scores of 2026-10-09). This page is refreshed as NVD updates the record.