---
id: CVE-2025-47912
title: >-
  The Parse function permits values other than IPv6 addresses to be included in
  square brackets within the host component of a URL
summary: >-
  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. …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
vendor: golang
product: go
affected:
  - go < 1.24.8
  - 'go >= 1.25.0, < 1.25.2'
patched:
  - go 1.25.2
published: '2025-10-29'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T23:10:00.237'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-47912'
references:
  - url: 'https://go.dev/cl/709857'
    label: security@golang.org
  - url: 'https://go.dev/issue/75678'
    label: security@golang.org
  - url: 'https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI'
    label: security@golang.org
  - url: 'https://pkg.go.dev/vuln/GO-2025-4010'
    label: security@golang.org
  - url: 'http://www.openwall.com/lists/oss-security/2025/10/08/1'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00468
epssPercentile: 0.38126
ingestedAt: '2026-09-30T23:29:32.457Z'
---

## Overview

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

- `go < 1.24.8`
- `go >= 1.25.0, < 1.25.2`

## Remediation

Upgrade past the affected range:

- `go 1.25.2`