Vulnerability · Published May 22, 2026 · Assigned by Go
CVE-2026-25680Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html
Medium 6.5
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 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 74.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-golang-x-net | no fix listed | DEBIAN-CVE-2026-25680 |
| Debian:13 | golang-golang-x-net | no fix listed | DEBIAN-CVE-2026-25680 |
| Debian:14 | golang-golang-x-net | 1:0.55.0-1 | DEBIAN-CVE-2026-25680 |
| Go | golang.org/x/net | 0.55.0 | GO-2026-5028 |
| Go | golang.org/x/net | 0.55.0 | GHSA-5cv4-jp36-h3mw |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| golang.org/x/net | golang.org/x/net/html | 0 – before 0.55.0 |