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

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No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Go standard library mime unaffected
Version Status Constraints
0 affected < 1.25.11
1.26.0-0 affected < 1.26.4

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Fixes

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References
Link Providers
https://go.dev/cl/774481 cve-icon cve-icon
https://go.dev/issue/79217 cve-icon cve-icon
https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw cve-icon cve-icon
https://pkg.go.dev/vuln/GO-2026-5038 cve-icon cve-icon
History

Wed, 03 Jun 2026 04:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-442

Wed, 03 Jun 2026 02:30:00 +0000

Type Values Removed Values Added
Description Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
Title Quadratic complexity in WordDecoder.DecodeHeader in mime
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-06-02T22:01:37.219Z

Reserved: 2026-04-28T00:21:12.792Z

Link: CVE-2026-42504

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-02T23:16:37.927

Modified: 2026-06-02T23:16:37.927

Link: CVE-2026-42504

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-03T04:15:24Z

Weaknesses