CVE-2026-42580: Netty vulnerable to HTTP Request Smuggling due to incorrect chunk size parsing

May 7, 2026

Netty’s chunk size parser silently overflows int, enabling request smuggling attacks.

References

github.com/advisories/GHSA-m4cv-j2px-7723
github.com/netty/netty
github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723
nvd.nist.gov/vuln/detail/CVE-2026-42580

Code Behaviors & Features

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