What is CVE-2026-42504?

CVE-2026-42504 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Quadratic complexity in WordDecoder.DecodeHeader in mime

Which CVE IDs does CVE-2026-42504 cover?

CVE-2026-42504 covers the following CVE IDs: CVE-2026-42504. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-42504?

CVE-2026-42504 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

CVE-2026-42504HighCVSS 7.5

Quadratic complexity in WordDecoder.DecodeHeader in mime

Vendor

Microsoft Security Response Center (MSRC)

Published

June 9, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-42504 →