CVE-2026-42504

HIGH

Quadratic complexity in WordDecoder.DecodeHeader in mime

Title source: cna
STIX 2.1

Description

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

References (4)

Core 4

Scores

CVSS v3 7.5
EPSS 0.0038
EPSS Percentile 30.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-407
Status published
Products (2)
Go standard library/mime < 1.25.11
Go standard library/mime 1.26.0-0 - 1.26.4
Published Jun 02, 2026
Tracked Since Jun 03, 2026