CVE-2025-47911

Quadratic parsing complexity in golang.org/x/net/html

State: Published
Severity: 5.3 Medium
Published: Feb 5, 2026
Updated: Feb 12, 2026
Reserved: May 13, 2025

Description

The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
golang.org/x/net/htmlgolang.org/x/net	before 0.45.0Affected

References

https://go.dev/cl/709876
https://github.com/golang/vulndb/issues/4440
https://groups.google.com/g/golang-announce/c/jnQcOYpiR2c
https://pkg.go.dev/vuln/GO-2026-4440

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