CVE-2026-42504
Quadratic complexity in WordDecoder.DecodeHeader in mime
7.5
HIGH
CVSS 3.1
EPSS 0.04%
Description
Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
How to fix CVE-2026-42504
To remediate CVE-2026-42504, upgrade the affected package to a fixed version below.
- Bitnami/golang—upgrade to 1.25.11 or later
- Debian/golang-1.15—no fix listed
- —no fix listed
- —no fix listed
- —upgrade to 1.25.11-1 or later
- —upgrade to 1.26.4-1 or later
- —upgrade to 1.25.11 or later
Is CVE-2026-42504 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (7)
- from 0, < 1.25.11, >= 1.26.0-0, < 1.26.4
- from 0
- from 0
- from 0
- from 0, < 1.25.11-1
- from 0, < 1.26.4-1
- from 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 |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |