CVE-2026-45673 MEDIUM

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

Vendor Netty
Product netty
Weakness CWE-330 · Insufficient randomness
Published June 12, 2026
Last update June 12, 2026
View on NVD All CVEs

CVSS base score

6.8/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 12, 2026 CVE published
June 12, 2026 Record updated