CVE-2026-42506

MEDIUM 6.1

Invoking incorrect handling of namespaced elements in foreign content in golang.org/x/net/html

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.

Vendor	golang.org/x/net
Product	golang.org/x/net/html
Published	May 22, 2026
Last Updated	May 22, 2026

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Affected Versions

golang.org/x/net / golang.org/x/net/html

0 < 0.55.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/issue/79571 groups.google.com: https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8 go.dev: https://go.dev/cl/781700 pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-5025

Credits

ensy