CVE-2026-33870 PUBLISHED

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

Assigner: GitHub_M
Reserved: 24.03.2026 Published: 27.03.2026 Updated: 27.03.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

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

References

Problem Types

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') CWE