CVE-2026-42579

Summary

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's DNS codec does not enforce RFC 1035 domain name constraints during either encoding or decoding. This creates a bidirectional attack surface: malicious DNS responses can exploit the decoder, and user-influenced hostnames can exploit the encoder. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Affected Software

Weaknesses

• CWE-20: CWE-20: Improper Input Validation
• CWE-400: CWE-400: Uncontrolled Resource Consumption
• CWE-626: CWE-626: Null Byte Interaction Error (Poison Null Byte)

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm

netty: Netty: High integrity impact due to improper DNS domain name constraint enforcement

Additional References

• https://access.redhat.com/security/cve/CVE-2026-42579
• https://bugzilla.redhat.com/show_bug.cgi?id=2477217
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42579.json
• https://access.redhat.com/errata/RHSA-2026:28010
• https://access.redhat.com/errata/RHSA-2026:25123
• https://access.redhat.com/errata/RHSA-2026:23808
• https://access.redhat.com/errata/RHSA-2026:24502

References

• https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm

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