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CVE-2026-73507 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b	[email protected]	Patch
https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6	[email protected]	Patch
https://github.com/netty/netty/releases/tag/netty-4.1.136.Final	[email protected]	Release Notes
https://github.com/netty/netty/releases/tag/netty-4.2.16.Final	[email protected]	Release Notes
https://github.com/netty/netty/security/advisories/GHSA-v74w-7mr3-4qg3	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-400	Uncontrolled Resource Consumption	[email protected]

Affected Products

Product	Versions
netty netty	< 4.1.136 >= 4.2.0, < 4.2.16
CPE cpe:2.3:a:netty:netty:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Sep 23, 2026	Initial Analysis	[email protected]
Aug 15, 2026	CVE Modified	CISA-ADP
Aug 13, 2026	New CVE Received	[email protected]