Medium 5.3Published Feb 5, 2026

CVE-2025-47911Quadratic parsing complexity in golang.org/x/net/html

Updated under an hour ago (Oct 28, 2026, 8:23 AM ET)

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It affects golang.org/x/net/html and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for golang.org/x/net/html

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Go
NVD analysis: Analyzed
Record last updated: Feb 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

golang.org/x/net golang.org/x/net/html golang.org_x_net:html (from the name)	before 0.45.0	CNA record
go html go:html	before 0.45.0	NVD

References

References

https://go.dev/cl/709876	patch
https://github.com/golang/vulndb/issues/4440	issue-tracking
https://groups.google.com/g/golang-announce/c/jnQcOYpiR2c	mailing-list, third-party-advisory
https://pkg.go.dev/vuln/GO-2026-4440	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.