CVE-2026-112939

{
  "id": "CVE-2026-112939",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-20T15:17:16.663",
  "lastModified": "2026-10-21T18:02:59.067",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can trust a forged process identifier in a marker that an attacker can modify but cannot remove, allowing an authorized contender such as another process of the holder's account or root to act as a confused deputy, remove the live marker, and admit another holder. This issue is fixed in version 4.2.1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "tox-dev",
          "product": "filelock",
          "versions": [
            {
              "version": ">= 3.22.0, < 4.2.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-20T15:14:32.481979Z",
          "id": "CVE-2026-112939",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:tox-dev:filelock:*:*:*:*:*:python:*:*",
              "versionStartIncluding": "3.22.0",
              "versionEndExcluding": "4.2.1",
              "matchCriteriaId": "5011FF77-7621-4E3E-8642-79A413FEAE97"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/tox-dev/filelock/commit/eeceaa846cbe4df72718d94c8371ca1ab8f5b3cc",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/tox-dev/filelock/pull/836",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/tox-dev/filelock/releases/tag/4.2.1",
      "source": "[email protected]",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Mitigation",
        "Patch",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Mitigation",
        "Patch",
        "Vendor Advisory"
      ]
    }
  ]
}