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netty

A vulnerability in Netty allows remote attackers to bypass security policies by sending specially crafted HTTP/2 or HTTP/3 Extended CONNECT requests. Netty incorrectly processes these requests as HTTP/1.1 CONNECT requests, causing loss of critical protocol and path information. This flaw can lead to authorization bypasses in applications relying on Netty for HTTP/2 or HTTP/3 communication, resulting in integrity loss. The vulnerability has a CVSS score of 7.5 (medium severity).

Netty's HTTP-object conversion path incorrectly downgrades HTTP/2 and HTTP/3 Extended CONNECT requests to standard HTTP/1.1 CONNECT requests. This misinterpretation causes loss of critical protocol and path information, enabling attackers to bypass security policies such as routing or authorization logic in applications that use Netty for HTTP/2 or HTTP/3 communication. The flaw impacts integrity by allowing unauthorized actions. The vulnerability is identified as CVE-2026-93568 with a CVSS v3.1 score of 7.5. Red Hat advisory confirms this issue affects multiple Netty versions and provides links to fixed versions and remediation guidance.

Detailed information about A flaw was found in Netty. A remote attacker could exploit this vulnerability by sending specially crafted HTTP/2 or HTTP/3 Extended 

A flaw was found in Netty. A remote attacker could exploit this vulnerability by sending specially crafted HTTP/2 or HTTP/3 Extended CONNECT requests. (CVE-2026-93568) - Live Threat Intelligence - Threat Radar | OffSeq.com

A flaw was found in Netty. A remote attacker could exploit this vulnerability by sending specially crafted HTTP/2 or HTTP/3 Extended CONNECT requests. (CVE-2026-93568)

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