PT-2026-38377 · Netty+3 · Netty+3
Published
2026-05-07
·
Updated
2026-06-16
·
CVE-2026-42585
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Name of the Vulnerable Software and Affected Versions
Netty versions prior to 4.2.13.Final
Netty versions prior to 4.1.133.Final
Description
Netty incorrectly parses malformed
Transfer-Encoding headers, which can lead to request smuggling attacks. Specifically, the framework incorrectly marks a request as chunked when the header Transfer-Encoding: chunked, identity is present. This occurs because the server fails to respond with a 400 (Bad Request) status code and close the connection when chunked transfer coding is not the final encoding, as required by RFC 9112. This issue can be exploited when Netty is positioned behind a proxy that forwards requests containing this malformed header but prefers Content-Length, allowing an attacker to inject arbitrary HTTP requests inside a request body.Recommendations
Update to version 4.2.13.Final.
Update to version 4.1.133.Final.
Exploit
Fix
DoS
HTTP Request/Response Smuggling
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Weakness Enumeration
Related Identifiers
Affected Products
Confluence
Linuxmint
Netty
Ubuntu