HTTP Request Smuggling Affecting netty package, versions <4.1.138-150200.4.56.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
2.19% (83rd percentile)

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  • Snyk IDSNYK-SLES157-NETTY-20305858
  • published30 Sept 2026
  • disclosed29 Sept 2026

Introduced: 29 Sep 2026

NewCVE-2026-93569  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade SLES:15.7 netty to version 4.1.138-150200.4.56.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream netty package and not the netty package as distributed by SLES. See How to fix? for SLES:15.7 relevant fixed versions and status.

A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.

CVSS Base Scores

version 3.1