Escaper bypass leads to XSS in html/template

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Summary

CVECVE-2026-39826
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-07 20:16:43 UTC
Updated2026-05-08 15:16:37 UTC
DescriptionIf a trusted template author were to write a <script> tag containing an empty 'type' attribute or a 'type' attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the <script> block.

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 0.032730000 (date 2026-05-12)

Problem Types: 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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Html/template affected 1.25.10 semver Not specified
CNA Go Standard Library Html/template affected 1.26.0-0 1.26.3 semver Not specified

References

ReferenceSourceLinkTags
go.dev/issue/78981 [email protected] go.dev
go.dev/cl/771180 [email protected] go.dev
pkg.go.dev/vuln/GO-2026-4980 [email protected] pkg.go.dev
groups.google.com/g/golang-announce/c/qcCIEXso47M [email protected] groups.google.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Mundur (https://github.com/M0nd0R) (en)

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