CVE-2026-45674 netty CVE debrief

Who should care

Defenders responsible for Netty deployments should verify exposure and apply patches. System administrators and security teams should review DNS response validation in affected systems. Operators of affected systems should prioritize verifying exposure and applying patches. Vulnerability management teams should review and implement compensating controls for exposed systems. Security teams should monitor for potential DNS response attacks.

Why it matters

Netty's DnsResolveContext vulnerability allows for potential DNS response attacks. Defenders should verify exposure, apply patches, and review DNS response validation.

• Verify and apply patches for Netty versions before 4.1.135.Final and 4.2.15.Final
• Review DNS response validation to prevent potential attacks
• Monitor for suspicious DNS activity

Technical summary

The DnsResolveContext in Netty fails to validate the origin (bailiwick) of CNAME records in DNS responses. This issue allows for potential DNS response attacks. Versions 4.1.135.Final and 4.2.15.Final patch the issue. The vulnerability is a DNS response validation issue in the DnsResolveContext of Netty. Affected systems should be reviewed for potential DNS response attacks. Defenders should prioritize verifying exposure and applying patches for Netty versions before 4.1.135.Final and 4.2.15.Final. The issue can be mitigated by reviewing DNS response validation.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Netty versions before 4.1.135.Final and 4.2.15.Final.

Recommended defensive actions

• Verify Netty version and apply patches if necessary
• Review DNS response validation in affected systems
• Monitor for potential DNS response attacks
• Perform vulnerability assessment to identify potential DNS response attacks
• Implement compensating controls for exposed systems
• Review asset inventory for affected Netty deployments
• Track exceptions and retest remediated assets

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. Netty versions before 4.1.135.Final and 4.2.15.Final are affected. Patches are available in versions 4.1.135.Final and 4.2.15.Final. The vulnerability allows for potential DNS response attacks. Defenders should verify exposure and apply patches. The issue is a DNS response validation issue in the DnsResolveContext of Netty.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.