CVE-2026-27142

Description

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.

References

https://pkg.go.dev/vuln/GO-2026-4603

https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk

https://go.dev/issue/77954

https://go.dev/cl/752081

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-10088

Details

Source: Mitre, NVD

Named Vulnerability: GO-2026-4603Named Vulnerability: GHSA-j4j7-vw47-rhfq

Risk Information

CVSS v2

CVSS v3

EPSS