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CVE-2026-27142

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

Published: Mar 6, 2026Updated: Apr 21, 2026 Sources: CVE List NVD BDUCWE-79
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.3%
Top 78.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-79

Affected Products

html/templateGo standard library
Library
OSS Libraries / go
gogolangOSS Libraries
Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
Openshift Service MeshRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / container-orchestration
Red Hat OpenShift Container PlatformRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / container-orchestration
go standard libraryoss-projectUSOSS Librariesaka golang standard library, net/http, crypto/x509, html/template
golangoss-projectUSOSS Libraries
red hat inc.commercialUSOperating Systemsaka red hat
and 5 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk
groups.google.com
https://go.dev/issue/77954
go.dev
https://go.dev/cl/752081
go.dev
and 5 more references View all →

Timeline

Published
Mar 6, 2026
Last Updated
Apr 21, 2026

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