CVE-2026-39823

UNKNOWN 0.0

Bypass of meta content URL escaping causes XSS in html/template

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.

Vendor	go standard library
Product	html/template
Published	May 7, 2026

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Affected Versions

Go standard library / html/template

0 < 1.25.10 1.26.0-0 < 1.26.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/issue/78913 go.dev: https://go.dev/cl/769920 groups.google.com: https://groups.google.com/g/golang-announce/c/qcCIEXso47M pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-4982

Credits

Samy Ghannad