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Security Advisories

GO-2026-5038

https://pkg.go.dev/vuln/GO-2026-5038

Severity

Unknown
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Summary

Quadratic complexity in WordDecoder.DecodeHeader in mime

Description

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

  • https://nvd.nist.gov/vuln/detail/CVE-2026-42504
  • https://github.com/advisories/GHSA-h524-452v-82p9
  • https://pkg.go.dev/vuln/GO-2026-5038
  • https://go.dev/issue/79217
  • https://go.dev/cl/774481
  • https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw

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