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

May 7, 2026 (updated May 14, 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/security/advisories/GHSA-m4cv-j2px-7723
nvd.nist.gov/vuln/detail/CVE-2026-42580

Code Behaviors & Features

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