Threat intelligence dashboard
CVE-2026-42504high

Quadratic complexity in WordDecoder.DecodeHeader in mime

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

Risk score

7.5

CVSS 3.1

Vendor
Go standard library
Product
mime
CWE
CWE-407
Published
Jun 2, 2026
Updated
Oct 31, 2026
CISA KEV
Not flagged

Affected products and versions

mime

Go standard library

Version / rangeStatusType
0 to before 1.25.11affectedsemver
1.26.0-0 to before 1.26.4affectedsemver

Technical metrics

7.5

CVSS 3.1

Severity
high
Source
CISA-ADP
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H