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

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Summary

CVECVE-2026-27142
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-06 22:16:01 UTC
Updated2026-04-21 14:30:01 UTC
DescriptionActions 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.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.000150000 probability, percentile 0.033990000 (date 2026-04-21)

Problem Types: CWE-79 | CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Golang Go All All All All
Application Golang Go 1.26.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Html/template affected 1.25.8 semver Not specified
CNA Go Standard Library Html/template affected 1.26.0-0 1.26.1 semver Not specified

References

ReferenceSourceLinkTags
pkg.go.dev/vuln/GO-2026-4603 [email protected] pkg.go.dev Vendor Advisory
groups.google.com/g/golang-announce/c/EdhZqrQ98hk [email protected] groups.google.com Release Notes
go.dev/cl/752081 [email protected] go.dev Mailing List
go.dev/issue/77954 [email protected] go.dev Issue Tracking
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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