CVE-2026-25681

Invoking incorrect handling of character references in DOCTYPE nodes in golang.org/x/net/html

State: Published
Severity: 6.1 Medium
Published: May 22, 2026
Updated: May 22, 2026
Reserved: Feb 5, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.1 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
golang.org/x/net/htmlgolang.org/x/net	before 0.55.0Affected

References

https://go.dev/issue/79574
https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8
https://go.dev/cl/781703
https://pkg.go.dev/vuln/GO-2026-5029

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