Improper Input Validation Affecting netty-codec-http2 package, versions *


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
2.56% (85th percentile)

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  • Snyk IDSNYK-RHEL7-NETTYCODECHTTP2-20123795
  • published24 Sept 2026
  • disclosed10 Sept 2026

Introduced: 10 Sep 2026

CVE-2026-93567  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:7 netty-codec-http2.

NVD Description

Note: Versions mentioned in the description apply only to the upstream netty-codec-http2 package and not the netty-codec-http2 package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leading to a malformed HTTP/2 CONNECT request. This can bypass security controls such as tunnel allow-lists or egress policies, resulting in integrity loss.

CVSS Base Scores

version 3.1