Vulnerability in Golang Go
CVE-2026-42499
Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.
EPSS: 0.000 (6.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Golang Go
- Go Standard Library Net/mail — versions 0, 1.26.0-0
References
- security@golang.org (Issue Tracking)
- security@golang.org (Patch)
- security@golang.org (Release Notes)
- security@golang.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42499?
- CVE-2026-42499 is a high-severity vulnerability in Golang Go, classified under CWE-407: INEFFICIENT ALGORITHMIC COMPLEXITY. CVSS score: 7.5/10. Published 2026-05-07.
- How severe is CVE-2026-42499?
- High severity. CVSS v3 base score is 7.5 out of 10.