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

Assessment

CVSS

7.5 (v3.1)

Severity

High

EPSS

0.56% chance of exploitation in the next 30 days

Known exploited

Not listed in CISA KEV

Exploit availability

Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories

Published

2 June 2026

Last updated

31 October 2026

Affected

Go standard library

Assigner

Go

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

At the source

• EUVD (ENISA)

References

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

Query this programmatically

Agents can read this through the MCP endpoint, or over HTTP:

curl https://cve.zerocrew.in/api/cve/CVE-2026-42504