Fix Javascript regexp context tracking in html/template

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-56858
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-13 22:17:22 UTC
Updated2026-08-14 16:16:57 UTC
DescriptionPreviously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Html/template affected 1.25.13 semver Not specified
CNA Go Standard Library Html/template affected 1.26.0-0 1.26.6 semver Not specified
CNA Go Standard Library Html/template affected 1.27.0-0 1.27.0-rc.3 semver Not specified

References

ReferenceSourceLinkTags
groups.google.com/g/golang-announce/c/94pEornpRlI [email protected] groups.google.com
go.dev/issue/80435 [email protected] go.dev
go.dev/cl/807100 [email protected] go.dev
pkg.go.dev/vuln/GO-2026-6091 [email protected] pkg.go.dev
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: Ali Sherif (en)

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