CVE-2026-33870
HIGH7.5EPSS 0.03%Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing
Published: 3/26/2026Modified: 4/28/2026
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 packages (2)
- Debian/nettyfrom 0
- Maven/io.netty:netty-codec-httpfrom 0, < 4.1.132.Final
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-33870
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-33870
- PATCHhttps://github.com/netty/netty
- WEBhttps://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8
- WEBhttps://w4ke.info/2025/06/18/funky-chunks.html
- WEBhttps://w4ke.info/2025/10/29/funky-chunks-2.html
- WEBhttps://www.rfc-editor.org/rfc/rfc9110