What is CVE-2025-47911?

CVE-2025-47911 is a medium-severity vulnerability in Go HTML, classified under CWE-400: UNCONTROLLED RESOURCE CONSUMPTION. CVSS score: 5.3/10. Published 2026-02-05.

How severe is CVE-2025-47911?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Go HTML

CVE-2025-47911

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.

Published 2026-02-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.005 (42.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

Affected products

Go HTML
Golang.org/x/net Golang.org/x/net/html — versions 0

References

go.dev/cl/709876 (Patch)
github.com/golang/vulndb/issues/4440 (Issue Tracking)
groups.google.com/g/golang-announce/c/jnQcOYpiR2c (Mailing List, Third Party Advisory)
pkg.go.dev/vuln/GO-2026-4440 (Vendor Advisory)

Frequently asked questions

What is CVE-2025-47911?: CVE-2025-47911 is a medium-severity vulnerability in Go HTML, classified under CWE-400: UNCONTROLLED RESOURCE CONSUMPTION. CVSS score: 5.3/10. Published 2026-02-05.
How severe is CVE-2025-47911?: Medium severity. CVSS v3 base score is 5.3 out of 10.