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CVE-2026-89044

netty · Vulnerability

CVSS 4.0 6.9 MEDIUMCVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-89044

Published

Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-89044

Published

netty

https://repo1.maven.org/maven2/io/netty/netty-codec-http/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "netty",
                    "product": "netty",
                    "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
                    "repo": "https://github.com/netty/netty",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:maven/io.netty/netty-codec-http",
                    "versions": [
                        {
                            "version": "4.1.133.Final",
                            "lessThan": "4.1.138.Final",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.2.13.Final",
                            "lessThan": "4.2.18.Final",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON