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Vulnerability record · CVE-2026-42504 · published 2 June 2026

CVE-2026-42504: Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.

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

7.5 CVSS 3.1 High EPSS 0.56% · top 55.6% CWE-407 · CWE-407 Undergoing Analysis
7.5CVSS 3.1 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
22 Jul 2026Last modified by NVD

Description

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

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

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-42504), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.