io.netty/netty-codec-http: Netty: CRLF Injection via Multipart Filename in Netty HttpPostRequestEncoder

A flaw was found in Netty's HttpPostRequestEncoder, a widely used Java networking library component responsible for constructing multipart HTTP request bodies. The issue arises because user-supplied filenames and field names are directly embedded into Content-Disposition MIME headers without any...

CVE-2026-59921

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, HttpPostRequestEncoder constructs multipart HTTP request bodies by directly concatenating user-supplied filenames and field names into Content-Disposition MIME headers without...

CVE-2026-59921

CVE-2026-59921 affects Netty’s HttpPostRequestEncoder. Before 4.1.136.Final and 4.2.16.Final, multipart HTTP request bodies were built by directly concatenating user-supplied filenames/field names into Content-Disposition headers without validating CRLF. This allows an attacker-controlled filenam...

CVE-2026-59921: Improper Neutralization of CRLF Sequences

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, HttpPostRequestEncoder constructs multipart HTTP request bodies by directly concatenating user-supplied filenames and field names into Content-Disposition MIME headers without...

CRLF Injection

Overview io.netty:netty-codec-http is a network application framework for rapid development of maintainable high performance protocol servers & clients. Affected versions of this package are vulnerable to CRLF Injection in the HttpPostRequestEncoder. An attacker can inject arbitrary MIME headers...