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netty

A vulnerability in Netty's HTTP/1.1 decoder allows remote attackers to bypass Transfer-Encoding header validation by splitting the Transfer-Encoding field across multiple headers, with the last field containing a non-final transfer coding such as gzip or deflate. This flaw enables HTTP request smuggling, which can lead to bypassing security controls, desynchronizing request processing, or causing requests to be processed in unintended contexts. The issue affects multiple specific Netty versions. The vulnerability has a CVSS score of 6.5 (medium severity).

CVE-2026-93573 is a vulnerability in Netty's HTTP/1.1 decoder where an attacker can bypass Transfer-Encoding header validation by splitting the Transfer-Encoding field across multiple headers, with the last field containing a non-final transfer coding like gzip or deflate. This improper handling allows HTTP request smuggling attacks, which can bypass front-end security controls or cause desynchronization in request processing when Netty is deployed with intermediaries interpreting these headers differently. The vulnerability affects numerous specific Netty versions as listed. Red Hat advisory references fixed versions and remediation guidance available at the Netty GitHub security advisories.

Detailed information about A flaw was found in Netty's HTTP/1.1 decoder. (CVE-2026-93573) affecting null netty. Get real-time updates, technical details, and mi

A flaw was found in Netty's HTTP/1.1 decoder. (CVE-2026-93573) - Live Threat Intelligence - Threat Radar | OffSeq.com

A flaw was found in Netty's HTTP/1.1 decoder. (CVE-2026-93573)

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