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.
Affected products
netty: netty
References10
- github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8 ExploitMitigationVendor Advisory
- w4ke.info/2025/06/18/funky-chunks.html Technical Description
- w4ke.info/2025/10/29/funky-chunks-2.html Technical Description
- www.rfc-editor.org/rfc/rfc9110 Technical Description
- access.redhat.com/errata/RHSA-2026:10175
- access.redhat.com/errata/RHSA-2026:10184
- access.redhat.com/errata/RHSA-2026:13571
- access.redhat.com/errata/RHSA-2026:14272
- access.redhat.com/errata/RHSA-2026:14276
- access.redhat.com/errata/RHSA-2026:17668
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - EPSS — exploit probability
- 1% percentile: 54 · as of 12 November 2026
- CWE
- CWE-444
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.