XSS in Golang Go
CVE-2026-27142
Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can allow XSS if the meta tag also has an http-equiv attribute with the value "refresh". A new GODEBUG setting has been added, htmlmetacontenturlescape, which can be used to disable escaping URLs in actions in the meta content attribute which follow "url=" by setting htmlmetacontenturlescape=0.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.003 (25.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Golang Go — versions 1.26.0
- Go Standard Library Html/template — versions 0, 1.26.0-0
Weakness classification (CWE)
References
- security@golang.org (Release Notes)
- security@golang.org (Issue Tracking)
- security@golang.org (Mailing List)
- security@golang.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-27142?
- CVE-2026-27142 is a medium-severity vulnerability in Golang Go, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-06.
- How severe is CVE-2026-27142?
- Medium severity. CVSS v3 base score is 6.1 out of 10.