Inconsistent interpretation of HTTP requests in Netty - CVE-2026-33870
Published: March 25, 2026
Vulnerability identifier: #VU124422
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/U:Green
CVE-ID: CVE-2026-33870
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: Netty project
Affected software:
Netty
Netty
Detailed vulnerability description
The vulnerability allows a remote attacker to perform HTTP request smuggling attacks.
The vulnerability exists due to improper validation of HTTP requests within chunked transfer encoding extension values. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.
How to mitigate CVE-2026-33870
Install updates from vendor's website.