CVE-2026-33870

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductNetty

PublishedMar 27, 2026

First seenMar 27, 2026

Weakness typeCWE-444CWE-444

How to fix

Update

netty netty4.1.132, 4.2.10 or later
io.netty:netty-codec-http4.1.132.Final, 4.2.10.Final or later

Vendor advisories

Affected products

Product	Affected versions	Fixed in
netty netty	v < 4.1.132, 4.2.0 ≤ v < 4.2.10	4.1.132, 4.2.10
io.netty:netty-codec-httpMaven	v < 4.1.132.Final, 4.2.0.Alpha1 ≤ v < 4.2.10.Final	4.1.132.Final, 4.2.10.Final

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