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Database

Asymmetric denial of service - ReDoS In netty

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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem
Component
Affected version
Patched versions

Aliases

1. CVE-2026-735072. NVD-2026-735073. OSV-2026-735074. OSV-DEBIAN-2026-735075. GHSA-v74w-7mr3-4qg36. GCVE-2026-735077. SECURITY-TRACKER-CVE-2026-73507

References

1. https://github.com/netty/netty/security/advisories/GHSA-v74w-7mr3-4qg32. https://github.com/netty/netty/pull/170633. https://github.com/netty/netty/pull/170654. https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b5. https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c66. https://github.com/netty/netty/releases/tag/netty-4.1.136.Final7. https://github.com/netty/netty/releases/tag/netty-4.2.16.Final

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