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CVE-2026-42504

Quadratic complexity in WordDecoder.DecodeHeader in mime

Published: Jun 2, 2026Updated: Jun 2, 2026 Sources: CVE List NVD
NVD MITRE
7.5CVSS
HIGH

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

EPSS Score
0.0%
Top 95.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High

Affected Products

mime
Go standard library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://go.dev/issue/79217
go.dev
https://go.dev/cl/774481
go.dev
https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw
groups.google.com
and 1 more references View all →

Timeline

Published
Jun 2, 2026
Last Updated
Jun 2, 2026

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