FKIE_CVE-2026-22701

Vulnerability from fkie_nvd - Published: 2026-01-10 06:15 - Updated: 2026-03-05 13:50
Severity ?
5.3 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
Summary
filelock is a platform-independent file lock for Python. Prior to version 3.20.3, a TOCTOU race condition vulnerability exists in the SoftFileLock implementation of the filelock package. An attacker with local filesystem access and permission to create symlinks can exploit a race condition between the permission validation and file creation to cause lock operations to fail or behave unexpectedly. The vulnerability occurs in the _acquire() method between raise_on_not_writable_file() (permission check) and os.open() (file creation). During this race window, an attacker can create a symlink at the lock file path, potentially causing the lock to operate on an unintended target file or leading to denial of service. This issue has been patched in version 3.20.3.
References
security-advisories@github.comhttps://github.com/tox-dev/filelock/commit/255ed068bc85d1ef406e50a135e1459170dd1bf0Patch
security-advisories@github.comhttps://github.com/tox-dev/filelock/commit/41b42dd2c72aecf7da83dbda5903b8087dddc4d5Patch
security-advisories@github.comhttps://github.com/tox-dev/filelock/security/advisories/GHSA-qmgc-5h2g-mvrwMitigation, Patch, Vendor Advisory
Impacted products
Vendor Product Version
tox-dev filelock *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:tox-dev:filelock:*:*:*:*:*:python:*:*",
              "matchCriteriaId": "C256B12F-691F-41C6-AFFF-DA6AF024AB6F",
              "versionEndExcluding": "3.20.3",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "filelock is a platform-independent file lock for Python. Prior to version 3.20.3, a TOCTOU race condition vulnerability exists in the SoftFileLock implementation of the filelock package. An attacker with local filesystem access and permission to create symlinks can exploit a race condition between the permission validation and file creation to cause lock operations to fail or behave unexpectedly. The vulnerability occurs in the _acquire() method between raise_on_not_writable_file() (permission check) and os.open() (file creation). During this race window, an attacker can create a symlink at the lock file path, potentially causing the lock to operate on an unintended target file or leading to denial of service. This issue has been patched in version 3.20.3."
    },
    {
      "lang": "es",
      "value": "filelock es un bloqueo de archivos independiente de la plataforma para Python. Antes de la versi\u00f3n 3.20.3, existe una vulnerabilidad de condici\u00f3n de carrera TOCTOU en la implementaci\u00f3n SoftFileLock del paquete filelock. Un atacante con acceso al sistema de archivos local y permiso para crear enlaces simb\u00f3licos puede explotar una condici\u00f3n de carrera entre la validaci\u00f3n de permisos y la creaci\u00f3n de archivos para hacer que las operaciones de bloqueo fallen o se comporten de manera inesperada. La vulnerabilidad ocurre en el m\u00e9todo _acquire() entre raise_on_not_writable_file() (\u0027verificaci\u00f3n de permisos\u0027) y os.open() (\u0027creaci\u00f3n de archivos\u0027). Durante esta ventana de carrera, un atacante puede crear un enlace simb\u00f3lico en la ruta del archivo de bloqueo, lo que podr\u00eda hacer que el bloqueo opere en un archivo de destino no deseado o que conduzca a una denegaci\u00f3n de servicio. Este problema ha sido parcheado en la versi\u00f3n 3.20.3."
    }
  ],
  "id": "CVE-2026-22701",
  "lastModified": "2026-03-05T13:50:02.570",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-10T06:15:52.673",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/tox-dev/filelock/commit/255ed068bc85d1ef406e50a135e1459170dd1bf0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/tox-dev/filelock/commit/41b42dd2c72aecf7da83dbda5903b8087dddc4d5"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-qmgc-5h2g-mvrw"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        },
        {
          "lang": "en",
          "value": "CWE-362"
        },
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.