CVE-2026-45673
Medium
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.
SeverityMedium
CVSS6.8
Exploit probability—
ProductNetty
PublishedJun 12, 2026
First seenJun 12, 2026
Weakness typeCWE-330CWE-330CWE-340CWE-340
How to fix
Update
- netty netty4.1.135, 4.2.15 or later
- io.netty:netty-resolver-dns4.2.15.Final, 4.1.135.Final or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| netty netty | v < 4.1.135, 4.2.0 ≤ v < 4.2.15 | 4.1.135, 4.2.15 |
| io.netty:netty-resolver-dnsMaven | 4.2.0.Final ≤ v < 4.2.15.Final, v < 4.1.135.Final | 4.2.15.Final, 4.1.135.Final |
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