High 7.5Published Aug 13, 2026

CVE-2026-73507Netty: Denial of Service in XmlFrameDecoder via CPU Exhaustion

Updated under an hour ago (2026-10-19 05:50 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Aug 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

netty netty netty:netty (from the name)	before 4.1.136.Final; from 4.2.0.Final, < 4.2.16.Final	CNA record
netty netty netty:netty	before 4.1.136; from 4.2.0 before 4.2.16	NVD

References

https://github.com/netty/netty/security/advisories/GHSA-v74w-7mr3-4qg3x-refsource-confirm, vendor-advisory
https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003bx-refsource-misc, patch
https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6x-refsource-misc, patch
https://github.com/netty/netty/releases/tag/netty-4.1.136.Finalx-refsource-misc, release-notes
https://github.com/netty/netty/releases/tag/netty-4.2.16.Finalx-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.