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Improper access to parent directory of root in os

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2025-22873
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 06:24 UTC · Revision 1

Source evidence

Improper access to parent directory of root in os

core-osv · Original source

Published 4 Feb 2026, 23:05 UTC

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.

osv:CVE-2025-22873
Complete source record
{
  "id": "6cb29befc7350b20bf1e0a37e388cfcc4bb066173e0a870bce65b56db6ff0cfd",
  "url": "https://osv.dev/vulnerability/CVE-2025-22873",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Improper access to parent directory of root in os",
    "summary": "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.",
    "evidence": "osv:CVE-2025-22873",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2025-22873",
      "aliases": [
        "BIT-golang-2025-22873",
        "CVE-2025-22873",
        "GO-2026-4403"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/golang/go",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f77084d15d53e6aa09d2e7f867e69cc9766da2c5"
                },
                {
                  "introduced": "3901409b5d0fb7c85a3e6730a59943cc93b2835c"
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                {
                  "fixed": "34c8b14ca9f4096383d658fbd748322a993a2bd2"
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              "database_specific": {
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                    "cpe": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
                    "range": [
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                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.24.0"
                      },
                      {
                        "fixed": "1.24.3"
                      }
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                    "source": "CPE_RANGE"
                  }
                ]
              }
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          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-22873.json"
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      ],
      "modified": "2026-10-28T02:30:26.283355848Z",
      "provider": "osv",
      "references": [
        "https://go.dev/cl/670036",
        "https://go.dev/issue/73555",
        "https://groups.google.com/g/golang-announce/c/UZoIkUT367A/m/5WDxKizJAQAJ",
        "https://pkg.go.dev",
        "https://pkg.go.dev/vuln/GO-2026-4403",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22873.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-22873"
      ],
      "provider_metadata": {
        "cna_assigner": "Go",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
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                    "fixed": "1.23.9"
                  },
                  {
                    "introduced": "1.24.0-0"
                  },
                  {
                    "fixed": "1.24.3"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22873.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-22873",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493033,
  "published_at": "2026-02-04T23:05:24.803+00:00"
}