CVE-2026-33870
Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing
7.5
HIGH
CVSS 3.1
EPSS 0.03%
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.
How to fix CVE-2026-33870
To remediate CVE-2026-33870, upgrade the affected package to a fixed version below.
- —no fix listed
- —upgrade to 4.1.132.Final or later
Is CVE-2026-33870 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0
- from 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 |