CVE-2026-42504
HIGH7.5EPSS 0.04%Quadratic complexity in WordDecoder.DecodeHeader in mime
Published: 6/2/2026Modified: 6/2/2026
Also known as:GO-2026-5038
Description
Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
Affected packages (1)
- Go/stdlibfrom 0, < 1.25.11, >= 1.26.0-0, < 1.26.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| nvd | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |