Medium 5.3Published Oct 29, 2025

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

Updated under an hour ago (Oct 28, 2026, 12:23 AM ET)

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It affects Go standard library net/url and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Go standard library net/url

Exploited in the last 30 days

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: 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-1286
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Go
NVD analysis: Analyzed
Record last updated: Nov 4, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Go standard library net/url go_standard_library:net_url (from the name)	before 1.24.8; from 1.25.0 before 1.25.2	CNA record
golang go golang:go	before 1.24.8; from 1.25.0 before 1.25.2	NVD

References

References

https://go.dev/issue/75678	issue-tracking
https://go.dev/cl/709857	patch
https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI	mailing-list, release-notes
https://pkg.go.dev/vuln/GO-2025-4010	vendor-advisory
http://www.openwall.com/lists/oss-security/2025/10/08/1	mailing-list, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.