Fluid Attacks Database

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
maven	io.netty:netty-codec-http	>=4.2.0.alpha1 <4.2.13.final \|\| >=0 <4.1.133.final	4.2.13.final, 4.1.133.final
debian 11	netty	=1:4.1.48-10 \|\| =1:4.1.48-11 \|\| =1:4.1.48-12 \|\| =1:4.1.48-13 \|\| =1:4.1.48-14 \|\| =1:4.1.48-15 \|\| =1:4.1.48-16 \|\| =1:4.1.48-4 \|\| =1:4.1.48-4+deb11u1 \|\| =1:4.1.48-4+deb11u2 \|\| =1:4.1.48-4+deb11u3 \|\| =1:4.1.48-5 \|\| =1:4.1.48-6 \|\| =1:4.1.48-7 \|\| =1:4.1.48-8 \|\| =1:4.1.48-9	-
debian 13	netty	=1:4.1.48-10 \|\| =1:4.1.48-10+deb13u1 \|\| =1:4.1.48-11 \|\| =1:4.1.48-12 \|\| =1:4.1.48-13 \|\| =1:4.1.48-14 \|\| =1:4.1.48-15 \|\| =1:4.1.48-16	-
debian 14	netty	=1:4.1.48-10 \|\| =1:4.1.48-11 \|\| =1:4.1.48-12 \|\| =1:4.1.48-13 \|\| =1:4.1.48-14 \|\| =1:4.1.48-15 \|\| =1:4.1.48-16	-
debian 12	netty	=1:4.1.48-10 \|\| =1:4.1.48-11 \|\| =1:4.1.48-12 \|\| =1:4.1.48-13 \|\| =1:4.1.48-14 \|\| =1:4.1.48-15 \|\| =1:4.1.48-16 \|\| =1:4.1.48-7 \|\| =1:4.1.48-7+deb12u1 \|\| =1:4.1.48-7+deb12u2 \|\| =1:4.1.48-8 \|\| =1:4.1.48-9	-

Aliases

1. CVE-2026-425852. NVD-2026-425853. OSV-2026-425854. OSV-DEBIAN-2026-425855. GHSA-38f8-5428-x5cv6. GCVE-2026-425857. SECURITY-TRACKER-CVE-2026-42585

References

1. https://github.com/netty/netty/security/advisories/GHSA-38f8-5428-x5cv2. https://datatracker.ietf.org/doc/html/rfc9112#name-message-body-length

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