Netty prior 4.1.136.Final/4.2.16.Final XmlFrameDecoder io.netty.handler.codec.xml.XmlFrameDecoder.decode resource consumption

Summaryinfo

A vulnerability marked as problematic has been reported in Netty. This vulnerability affects the function io.netty.handler.codec.xml.XmlFrameDecoder.decode of the component XmlFrameDecoder. The manipulation leads to resource consumption. This vulnerability is referenced as CVE-2026-73507. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Netty. It has been rated as problematic. This issue affects the function io.netty.handler.codec.xml.XmlFrameDecoder.decode of the component XmlFrameDecoder. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.xml.XmlFrameDecoder.decode() failed to preserve closing-tag parser state across invocations, so an unauthenticated remote attacker could trickle-feed repeated </ sequences that repeatedly rescanned the accumulated buffer and exhausted an EventLoop thread's CPU, causing denial of service with a maxFrameLength of 1 MB. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-73507 since 08/12/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 4.1.136.Final or 4.2.16.Final eliminates this vulnerability.

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Productinfo

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• Netty

Website

• Product: https://github.com/netty/netty/

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