What’s Vulnerable › Vulnerabilities

CVE-2026-25680: Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-22 · updated 2026-07-23
• Weakness: CWE-400

Description

Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service.

Affected products

• golang.org/x/net/html: before 0.55.0 — fixed in 0.55.0
• Golang.Org/X/Net: before 0.55.0 — fixed in 0.55.0

How to fix

Upgrade to a fixed version: golang.org/x/net/html 0.55.0; Golang.Org/X/Net 0.55.0. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/781702
• https://go.dev/issue/79573
• https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8
• https://pkg.go.dev/vuln/GO-2026-5028

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