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Vulnerability Report: GO-2026-4980

standard library

CVE-2026-39826
Affects: html/template
Published: May 07, 2026

If 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.

Affected Packages

Path

Go Versions

Symbols
html/template

before go1.25.10, from go1.26.0-0 before go1.26.3
- Template.Execute
- Template.ExecuteTemplate

Aliases

CVE-2026-39826

References

Credits

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

Feedback

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