CVE-2025-47912

Insufficient validation of bracketed IPv6 hostnames in net/url

MEDIUM

5.3

CVSS Score

Published: October 29, 2025 at 10:10 PM UTC

Updated: October 8, 2026 at 10:10 AM UTC

2 products affected across 2 vendorsGoNet/url

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Severity

MEDIUM5.3

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Go · Golang

95%

v < 1.24.81.25.0 ≤ v < 1.25.2

Affected range stops below 1.24.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.25.2, so it looks safe — our inference, not a vendor statement

Net/url · Go Standard Librarygo

60%

v < 1.24.81.25.0 ≤ v < 1.25.21.25.0

Affected range stops below 1.24.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.25.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

Issue Tracking

Source: cverecord

https://go.dev/issue/75678

Patch

Source: cverecord

https://go.dev/cl/709857

Mailing ListRelease Notes

Source: cverecord

https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI

Vendor Advisory

Source: cverecord

https://pkg.go.dev/vuln/GO-2025-4010

Mailing ListRelease Notes

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2025/10/08/1

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: LOW
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

NVD-CWE-noinfo

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