BIT-GOLANG-2026-42504 Quadratic complexity in WordDecoder.DecodeHeader in mime

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU...

CVE-2026-42504 Quadratic complexity in WordDecoder.DecodeHeader in mime

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU...

CVE-2026-42504

CVE-2026-42504 affects the WordDecoder.DecodeHeader function in the mime package, where decoding a malicious MIME header with many invalid encoded-words leads to quadratic time complexity and potential high CPU usage. Public descriptions identify the root cause as quadratic complexity in that dec...

GO-2026-5038 Quadratic complexity in WordDecoder.DecodeHeader in mime

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU...