HTTP Request Smuggling Affecting netty-tcnative package, versions <2.0.77-150200.3.39.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.61% (45th percentile)

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  • Snyk IDSNYK-SLES156-NETTYTCNATIVE-17278691
  • published10 Jun 2026
  • disclosed9 Jun 2026

Introduced: 9 Jun 2026

CVE-2026-42581  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade SLES:15.6 netty-tcnative to version 2.0.77-150200.3.39.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream netty-tcnative package and not the netty-tcnative package as distributed by SLES. See How to fix? for SLES:15.6 relevant fixed versions and status.

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundaries, enabling request smuggling. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CVSS Base Scores

version 3.1