CVE-2026-112914 (GCVE-0-2026-112914)

Vulnerability from cvelistv5 – Published: 2026-10-20 14:26 – Updated: 2026-10-20 14:26
VLAI
Title
filelock: SoftFileLock stale-break restore follows a swapped-in symbolic link and hard-links a file of the user running the lock into the lock directory
Summary
filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock can restore a stale marker by name after moving it aside, allowing another local user with rename access in a non-sticky lock directory to swap in a symbolic link and, on a runtime that follows the link and a same-filesystem target, make the lock user hard-link one of its files into the lock directory. This issue is fixed in version 4.2.1.
Severity
5.3 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
CWE
  • CWE-363 - Race Condition Enabling Link Following
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
tox-dev filelock Affected: >= 4.1.0, < 4.2.1
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-20T14:26:18.813Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tox-dev/filelock/security/advisories/GHSA-crv4-6mhj-j5jh",
          "tags": [
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          "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-crv4-6mhj-j5jh"
        },
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          "name": "https://github.com/tox-dev/filelock/pull/843",
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          "url": "https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b"
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          "tags": [
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      ],
      "source": {
        "advisory": "GHSA-crv4-6mhj-j5jh",
        "discovery": "UNKNOWN"
      },
      "title": "filelock: SoftFileLock stale-break restore follows a swapped-in symbolic link and hard-links a file of the user running the lock into the lock directory"
    }
  },
  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-112914",
    "datePublished": "2026-10-20T14:26:18.813Z",
    "dateReserved": "2026-10-19T20:16:09.858Z",
    "dateUpdated": "2026-10-20T14:26:18.813Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "epss": "0.00083",
      "percentile": "0.00236"
    },
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      "cve": {
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                  {
                    "status": "affected",
                    "version": "\u003e= 4.1.0, \u003c 4.2.1"
                  }
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        "cveTags": [],
        "descriptions": [
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            "lang": "en",
            "value": "filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock can restore a stale marker by name after moving it aside, allowing another local user with rename access in a non-sticky lock directory to swap in a symbolic link and, on a runtime that follows the link and a same-filesystem target, make the lock user hard-link one of its files into the lock directory. This issue is fixed in version 4.2.1."
          }
        ],
        "id": "CVE-2026-112914",
        "lastModified": "2026-10-20T19:50:26.943",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
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          },
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            "url": "https://github.com/tox-dev/filelock/pull/843"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/tox-dev/filelock/releases/tag/4.2.1"
          },
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            "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-crv4-6mhj-j5jh"
          }
        ],
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        "vulnStatus": "Undergoing Analysis",
        "weaknesses": [
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            "description": [
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                "lang": "en",
                "value": "CWE-363"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-20T18:16:24+00:00",
      "cve": "CVE-2026-112914",
      "id": "CVE-2026-112914",
      "initial_release_date": "2026-10-20T14:26:18.813000+00:00",
      "product_status:known_affected": "125",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "filelock: filelock: Unauthorized file exposure via symbolic link manipulation in SoftFileLock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-112914.json",
      "version": "3"
    }
  }
}



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