CVE-2026-42504

Description

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

References

• https://go.dev/cl/774481
• https://go.dev/issue/79217
• https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw
• https://pkg.go.dev/vuln/GO-2026-5038