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CVE-2026-73507 Netty

Affected softwareNetty
Severity7.5 High CVSS 3.1
Fixed in4.2.16.Final, 4.1.136.Final
WeaknessUncontrolled resource consumption (CWE-400)
Published13 Aug 2026
Updated23 Sep 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.79% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: netty/netty 5b68c61.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b : a commit: the change itself

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗ CPU 2026-Q4 Oracle Communications / Core (Netty) (6.1.1-7.0.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Core (Netty) 6.1.1-7.0.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.netty:netty-codec-xml 4.2.0.Final 4.2.16.Final unbounded
io.netty:netty-codec-xml 0 4.1.136.Final unbounded

Products and versions

2 products, 4 version entries
SourceVendorProductSchemeAffected versions
osv io.netty netty-codec-xml generic < 4.1.136 · ≥ 4.2.0 and < 4.2.16
nvd netty netty generic < 4.1.136 · ≥ 4.2.0 and < 4.2.16

References

URLTags
https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b commit
https://github.com/netty/netty/security/advisories/GHSA-v74w-7mr3-4qg3 WEB
https://github.com/netty/netty/pull/17063 WEB
https://github.com/netty/netty/pull/17065 WEB
https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 WEB
https://github.com/netty/netty PACKAGE
https://github.com/netty/netty/releases/tag/netty-4.1.136.Final WEB
https://github.com/netty/netty/releases/tag/netty-4.2.16.Final WEB

Timeline

Published2026-08-13By the CVE Program.
NVD record modified2026-09-23NVD's own last-modified date for this record.