What’s Vulnerable › Vulnerabilities

CVE-2025-47912: Insufficient validation of bracketed IPv6 hostnames in net/url

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-29 · updated 2026-10-08

Description

The Parse function permits values other than IPv6 addresses to be included in square brackets within the host component of a URL. RFC 3986 permits IPv6 addresses to be included within the host component, enclosed within square brackets. For example: "http://[::1]/". IPv4 addresses and hostnames must not appear within square brackets. Parse did not enforce this requirement.

Affected products

• Go: before 1.24.8; from 1.25.0 before 1.25.2 — fixed in 1.24.8, 1.25.2

How to fix

Upgrade to a fixed version: Go 1.24.8, 1.25.2. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/709857
• https://go.dev/issue/75678
• https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI
• https://pkg.go.dev/vuln/GO-2025-4010
• http://www.openwall.com/lists/oss-security/2025/10/08/1

Get alerted when CVE-2025-47912 or the next vulnerability affects your stack