CVE-2026-112934 (GCVE-0-2026-112934)

Vulnerability from cvelistv5 – Published: 2026-10-20 14:30 – Updated: 2026-10-20 14:30
VLAI
Title
filelock: SoftReadWriteLock holder refresh writes through a hard link and hangs on a named pipe that another local user renames over its record
Summary
filelock is a platform-independent file lock for Python. From 4.0.0 until 4.2.1, SoftReadWriteLock refreshes holder records by name, allowing another local user with rename access to the lock directory to replace a record with a named pipe and stall the lock, or under a permissive hard-link policy to link a reachable target file and cause the lock user to write through it. This issue is fixed in version 4.2.1.
Severity
6.1 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
CWE
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7627 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
tox-dev filelock Affected: >= 4.0.0, < 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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          "vendor": "tox-dev",
          "versions": [
            {
              "status": "affected",
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            }
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      ],
      "descriptions": [
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          "value": "filelock is a platform-independent file lock for Python. From 4.0.0 until 4.2.1, SoftReadWriteLock refreshes holder records by name, allowing another local user with rename access to the lock directory to replace a record with a named pipe and stall the lock, or under a permissive hard-link policy to link a reachable target file and cause the lock user to write through it. This issue is fixed in version 4.2.1."
        }
      ],
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          }
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            }
          ]
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      ],
      "providerMetadata": {
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tox-dev/filelock/security/advisories/GHSA-fj95-fr6c-h845",
          "tags": [
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          ],
          "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-fj95-fr6c-h845"
        },
        {
          "name": "https://github.com/tox-dev/filelock/pull/842",
          "tags": [
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          "url": "https://github.com/tox-dev/filelock/pull/842"
        },
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        },
        {
          "name": "https://github.com/tox-dev/filelock/releases/tag/4.2.1",
          "tags": [
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          ],
          "url": "https://github.com/tox-dev/filelock/releases/tag/4.2.1"
        }
      ],
      "source": {
        "advisory": "GHSA-fj95-fr6c-h845",
        "discovery": "UNKNOWN"
      },
      "title": "filelock: SoftReadWriteLock holder refresh writes through a hard link and hangs on a named pipe that another local user renames over its record"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-112934",
    "datePublished": "2026-10-20T14:30:43.736Z",
    "dateReserved": "2026-10-19T21:30:47.244Z",
    "dateUpdated": "2026-10-20T14:30:43.736Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-10-21",
      "epss": "0.00125",
      "percentile": "0.02041"
    },
    "nvd": {
      "cve": {
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                "product": "filelock",
                "vendor": "tox-dev",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 4.0.0, \u003c 4.2.1"
                  }
                ]
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            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "filelock is a platform-independent file lock for Python. From 4.0.0 until 4.2.1, SoftReadWriteLock refreshes holder records by name, allowing another local user with rename access to the lock directory to replace a record with a named pipe and stall the lock, or under a permissive hard-link policy to link a reachable target file and cause the lock user to write through it. This issue is fixed in version 4.2.1."
          }
        ],
        "id": "CVE-2026-112934",
        "lastModified": "2026-10-20T19:50:26.943",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
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                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
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        "references": [
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            "url": "https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/tox-dev/filelock/pull/842"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/tox-dev/filelock/releases/tag/4.2.1"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-fj95-fr6c-h845"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Undergoing Analysis",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-62"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-20T18:16:27+00:00",
      "cve": "CVE-2026-112934",
      "id": "CVE-2026-112934",
      "initial_release_date": "2026-10-20T14:30:43.736000+00:00",
      "product_status:known_affected": "125",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "filelock: filelock: Denial of Service via insecure holder record refresh",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-112934.json",
      "version": "3"
    }
  }
}



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