CVE-2026-33870 HIGH

CVE-2026-33870: Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing

Vendor Netty
Product netty
Weakness CWE-444
Published March 27, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 27, 2026 CVE published
June 30, 2026 Record updated