Vulnerability · Published Feb 5, 2026 · Assigned by Go
CVE-2025-47911Quadratic parsing complexity in golang.org/x/net/html
Medium 5.3
In plain English
A medium-severity security flaw in golang.org/x/net/html from golang.org/x/net. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.6%top 53.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-golang-x-net | no fix listed | DEBIAN-CVE-2025-47911 |
| Debian:13 | golang-golang-x-net | no fix listed | DEBIAN-CVE-2025-47911 |
| Debian:14 | golang-golang-x-net | 1:0.47.0-1 | DEBIAN-CVE-2025-47911 |
| Go | golang.org/x/net | 0.45.0 | GO-2026-4440 |
| Go | golang.org/x/net/html | 0.45.0 | GHSA-w4gw-w5jq-g9jh |
| Ubuntu:22.04:LTS | golang-golang-x-net | 1:0.0+git20211209.491a49a+dfsg-1ubuntu0.1 | USN-8900-1 |
| Ubuntu:22.04:LTS | golang-golang-x-net | 1:0.0+git20211209.491a49a+dfsg-1ubuntu0.1 | UBUNTU-CVE-2025-47911 |
| Ubuntu:25.10 | golang-golang-x-net | no fix listed | UBUNTU-CVE-2025-47911 |
| Ubuntu:26.04:LTS | golang-golang-x-net | no fix listed | UBUNTU-CVE-2025-47911 |
| Ubuntu:26.10 | golang-golang-x-net | no fix listed | UBUNTU-CVE-2025-47911 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| golang.org/x/net | golang.org/x/net/html | 0 – before 0.45.0 |