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GO-2026-4980

Escaper bypass leads to XSS in html/template

Quick fix

GO-2026-4980 — stdlib: upgrade to the fixed version with the command below.

go get stdlib@v1.25.10

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

Go / stdlib

Introduced in: 0 Fixed in: 1.25.10

Fix go get stdlib@v1.25.10

References

https://go.dev/issue/78981 [REPORT]
https://go.dev/cl/771180 [FIX]
https://groups.google.com/g/golang-announce/c/qcCIEXso47M [WEB]