# CVE-2026-42504

## Summary

- **CVE ID:** CVE-2026-42504
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** N/A
- **Published:** Jun 2, 2026
- **Last Modified:** Sep 17, 2026

## Description

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

## Affected Products

- Go standard library — mime (0)
- Go standard library — mime (1.26.0-0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.56%
- **EPSS Percentile:** 45.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._