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's chunk size parser silently overflows int, 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 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	-
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 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	-

Aliases

1. CVE-2026-425802. NVD-2026-425803. OSV-2026-425804. OSV-DEBIAN-2026-425805. GHSA-m4cv-j2px-77236. GCVE-2026-425807. SECURITY-TRACKER-CVE-2026-42580

References

1. https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723

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