Improper access to parent directory of root in os

3.8 / 10

LOW

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

Description

It was possible to improperly access the parent directory of an os.Root by opening a filename ending in "../". For example, Root.Open("../") would open the parent directory of the Root. This escape only permits opening the parent directory itself, not ancestors of the parent or files contained within the parent.

Basic Information

ID CVE-2025-22873

Source Go

Published Feb 4, 2026 at 23:05

Modified Feb 5, 2026 at 15:03

Affected Product

Vendor Go standard library

Product os

Affected Versions Go standard library os 0
Go standard library os 1.24.0-0

CWE Classification

CWE-23

References

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    "description": "It was possible to improperly access the parent directory of an os.Root by opening a filename ending in \"../\". For example, Root.Open(\"../\") would open the parent directory of the Root. This escape only permits opening the parent directory itself, not ancestors of the parent or files contained within the parent.",
    "published": "2026-02-04T23:05:24.803Z",
    "modified": "2026-02-05T15:03:55.451Z",
    "type": "cve",
    "title": "Improper access to parent directory of root in os",
    "source": "Go",
    "references": "https://go.dev/cl/670036\nhttps://go.dev/issue/73555\nhttps://groups.google.com/g/golang-announce/c/UZoIkUT367A/m/5WDxKizJAQAJ\nhttps://pkg.go.dev/vuln/GO-2026-4403",
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    "sourceData": "Go standard library os 0\nGo standard library os 1.24.0-0",
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    "cvss": {
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        "version": "3.1"
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    "product": "os",
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Improper access to parent directory of root in os_CVE-2025-22873