CVE-2025-47912

Insufficient validation of bracketed IPv6 hostnames in net/url

CVSS 5.3 MEDIUMEPSS 0.4%

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.3EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

29 Oct 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

Go standard library · net/url

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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