CVE-2026-73507
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductNetty
PublishedAug 13, 2026
First seenAug 13, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- netty netty4.1.136, 4.2.16 or later
- io.netty:netty-codec-xml4.2.16.Final, 4.1.136.Final or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| netty netty | v < 4.1.136, 4.2.0 ≤ v < 4.2.16 | 4.1.136, 4.2.16 |
| io.netty:netty-codec-xmlMaven | 4.2.0.Final ≤ v < 4.2.16.Final, v < 4.1.136.Final | 4.2.16.Final, 4.1.136.Final |
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