CVE-2026-27142medium

CVE-2026-27142: medium-severity vulnerability in Go standard library html/template

URLs in meta content attribute actions are not escaped in html/template

Published · Updated

Follow this CVE+ Monitor html/template+ Monitor go

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.1epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
Go standard library · html/template
Related CVEs — Go standard library html/template

In the same product, most dangerous first.

CVE-2023-24538CRITICALBackticks not treated as string delimiters in html/templateEPSS 2.3%CVE-2023-24540CRITICALImproper handling of JavaScript whitespace in html/templateEPSS 1.6%CVE-2023-24539HIGHImproper sanitization of CSS values in html/templateEPSS 1.0%CVE-2023-29400HIGHImproper handling of empty HTML attributes in html/templateEPSS 1.0%CVE-2023-39318—Improper handling of HTML-like comments in script contexts in html/templateEPSS 0.9%CVE-2023-39319—Improper handling of special tags within script contexts in html/templateEPSS 0.9%