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CVE

CWE

Training

CVE-2026-33870

Published: Mar 27, 2026

Modified: Mar 31, 2026

PUBLISHED

CVSS v3.1

7.5

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.

Vendor	Product	Versions
netty	netty	affected `< 4.1.132.Final` affected `>= 4.2.0.Alpha1, < 4.2.10.Final`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

References

https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8

x_refsource_CONFIRM

https://w4ke.info/2025/06/18/funky-chunks.html

x_refsource_MISC

https://w4ke.info/2025/10/29/funky-chunks-2.html

x_refsource_MISC

https://www.rfc-editor.org/rfc/rfc9110

x_refsource_MISC

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