Medium 6.1Published Mar 6, 2026

CVE-2026-27142URLs in meta content attribute actions are not escaped in html/template

Updated under an hour ago (Oct 26, 2026, 7:00 AM ET)

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It affects Go standard library html/template and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Go standard library html/template

Exploited in the last 30 days

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: 6.1 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Go
NVD analysis: Analyzed
Record last updated: Mar 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Go standard library html/template go_standard_library:html_template (from the name)	before 1.25.8; from 1.26.0-0 before 1.26.1	CNA record
golang go golang:go	before 1.25.8; 1.26.0	NVD

References

https://groups.google.com/g/golang-announce/c/EdhZqrQ98hkrelease-notes
https://go.dev/issue/77954issue-tracking
https://go.dev/cl/752081mailing-list
https://pkg.go.dev/vuln/GO-2026-4603vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.