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CVE-2026-42504— Quadratic complexity in WordDecoder.DecodeHeader in mime

AI Predicted 5.3 Difficulty: Easy

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-42504

Vulnerability Information
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Vulnerability Title
Quadratic complexity in WordDecoder.DecodeHeader in mime
Source: NVD (National Vulnerability Database)
Vulnerability Description
Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Go standard librarymime 0 ~ 1.25.11 -

II. Public POCs for CVE-2026-42504

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III. Intelligence Information for CVE-2026-42504

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Patches & Fixes for CVE-2026-42504 (1)

Vendor Advisories for CVE-2026-42504 (2)

Vendor Pages for CVE-2026-42504 (1)

Same Patch Batch · Go standard library · 2026-06-02 · 3 CVEs total

CVE-2026-42507Arbitrary inputs are included in errors without any escaping in net/textproto
CVE-2026-27145Inefficient candidate hostname parsing in crypto/x509

IV. Related Vulnerabilities

Same vendor: Go standard library

V. Comments for CVE-2026-42504

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