Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Netty | Netty | < 4.1.133 |
Related Weaknesses (CWE)
References
- https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fmExploitMitigationVendor Advisory
- https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fmExploitMitigationVendor Advisory
FAQ
What is CVE-2026-42579?
CVE-2026-42579 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 encodin...
How severe is CVE-2026-42579?
CVE-2026-42579 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42579?
Check the references section above for vendor advisories and patch information. Affected products include: Netty Netty.