CVE-2026-56858

UNKNOWN 0.0

Fix Javascript regexp context tracking in html/template

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.

Vendor	go standard library
Product	html/template
Published	Aug 13, 2026

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Affected Versions

Go standard library / html/template

0 < 1.25.13 1.26.0-0 < 1.26.6 1.27.0-0 < 1.27.0-rc.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/issue/80435 go.dev: https://go.dev/cl/807100 groups.google.com: https://groups.google.com/g/golang-announce/c/94pEornpRlI pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-6091

Credits

Ali Sherif