Vulnerability Description
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, Netty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks. Versions 4.1.132.Final and 4.2.10.Final fix the issue.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Netty | Netty | < 4.1.132 |
Related Weaknesses (CWE)
References
- https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8ExploitMitigationVendor Advisory
- https://w4ke.info/2025/06/18/funky-chunks.htmlTechnical Description
- https://w4ke.info/2025/10/29/funky-chunks-2.htmlTechnical Description
- https://www.rfc-editor.org/rfc/rfc9110Technical Description
FAQ
What is CVE-2026-33870?
CVE-2026-33870 is a vulnerability with a CVSS score of 7.5 (HIGH). Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, Netty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding...
How severe is CVE-2026-33870?
CVE-2026-33870 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-2026-33870?
Check the references section above for vendor advisories and patch information. Affected products include: Netty Netty.