CVE-2026-73507CWE-400denial-of-service

CVE-2026-73507

High · published August 13, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
55.9
In the wild
Unconfirmed
What it 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 record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00793 · 55.9th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-08-13T19:20Z
Affected products (2)
ProductVersionsFixed in
netty/netty< 4.1.1364.1.136
netty/netty≥ 4.2.0, < 4.2.164.2.16
References (5)
https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b · [email protected]https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 · [email protected]https://github.com/netty/netty/releases/tag/netty-4.1.136.Final · [email protected]https://github.com/netty/netty/releases/tag/netty-4.2.16.Final · [email protected]https://github.com/netty/netty/security/advisories/GHSA-v74w-7mr3-4qg3 · [email protected]
EPSS history
Timeline
  • 13 AUG 14:25Z
    Netty: Denial of Service in XmlFrameDecoder via CPU Exhaustion
    cvelistv5