Vulnerability-Lookup

SUSE-SU-2026:0082-1

Vulnerability from csaf_suse - Published: 2026-01-09 09:12 - Updated: 2026-01-09 09:12

Summary

Security update for python-filelock

Notes

Title of the patch

Security update for python-filelock

Description of the patch

This update for python-filelock fixes the following issues: - CVE-2025-68146: TOCTOU race condition may allow local attackers to corrupt or truncate arbitrary user files (bsc#1255244).

Patchnames

SUSE-2026-82,SUSE-SLE-Module-Development-Tools-15-SP7-2026-82,SUSE-SLE-Module-Packagehub-Subpackages-15-SP7-2026-82

CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).

JSON

To clipboard

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  "vulnerabilities": [
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          "text": "filelock is a platform-independent file lock for Python. In versions prior to 3.20.1, a Time-of-Check-Time-of-Use (TOCTOU) race condition allows local attackers to corrupt or truncate arbitrary user files through symlink attacks. The vulnerability exists in both Unix and Windows lock file creation where filelock checks if a file exists before opening it with O_TRUNC. An attacker can create a symlink pointing to a victim file in the time gap between the check and open, causing os.open() to follow the symlink and truncate the target file. All users of filelock on Unix, Linux, macOS, and Windows systems are impacted. The vulnerability cascades to dependent libraries. The attack requires local filesystem access and ability to create symlinks (standard user permissions on Unix; Developer Mode on Windows 10+). Exploitation succeeds within 1-3 attempts when lock file paths are predictable. The issue is fixed in version 3.20.1. If immediate upgrade is not possible, use SoftFileLock instead of UnixFileLock/WindowsFileLock (note: different locking semantics, may not be suitable for all use cases); ensure lock file directories have restrictive permissions (chmod 0700) to prevent untrusted users from creating symlinks; and/or monitor lock file directories for suspicious symlinks before running trusted applications. These workarounds provide only partial mitigation. The race condition remains exploitable. Upgrading to version 3.20.1 is strongly recommended.",
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          "date": "2026-01-09T09:12:48Z",
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        }
      ],
      "title": "CVE-2025-68146"
    }
  ]
}

CVE-2025-68146 (GCVE-0-2025-68146)

Vulnerability from cvelistv5 – Published: 2025-12-16 18:10 – Updated: 2025-12-17 18:51

Title

filelock has TOCTOU race condition that allows symlink attacks during lock file creation

Summary

filelock is a platform-independent file lock for Python. In versions prior to 3.20.1, a Time-of-Check-Time-of-Use (TOCTOU) race condition allows local attackers to corrupt or truncate arbitrary user files through symlink attacks. The vulnerability exists in both Unix and Windows lock file creation where filelock checks if a file exists before opening it with O_TRUNC. An attacker can create a symlink pointing to a victim file in the time gap between the check and open, causing os.open() to follow the symlink and truncate the target file. All users of filelock on Unix, Linux, macOS, and Windows systems are impacted. The vulnerability cascades to dependent libraries. The attack requires local filesystem access and ability to create symlinks (standard user permissions on Unix; Developer Mode on Windows 10+). Exploitation succeeds within 1-3 attempts when lock file paths are predictable. The issue is fixed in version 3.20.1. If immediate upgrade is not possible, use SoftFileLock instead of UnixFileLock/WindowsFileLock (note: different locking semantics, may not be suitable for all use cases); ensure lock file directories have restrictive permissions (chmod 0700) to prevent untrusted users from creating symlinks; and/or monitor lock file directories for suspicious symlinks before running trusted applications. These workarounds provide only partial mitigation. The race condition remains exploitable. Upgrading to version 3.20.1 is strongly recommended.

Severity ?

6.3 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-59 - Improper Link Resolution Before File Access ('Link Following')
CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/tox-dev/filelock/security/advi…	x_refsource_CONFIRM
	https://github.com/tox-dev/filelock/pull/461	x_refsource_MISC
	https://github.com/tox-dev/filelock/commit/4724d7…	x_refsource_MISC
	https://github.com/tox-dev/filelock/releases/tag/3.20.1	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	tox-dev	filelock	Affected: < 3.20.1

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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            "other": {
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                "id": "CVE-2025-68146",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-17T14:51:03.763957Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        ],
        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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          "product": "filelock",
          "vendor": "tox-dev",
          "versions": [
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        }
      ],
      "metrics": [
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          "tags": [
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        },
        {
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      "title": "filelock has TOCTOU race condition that allows symlink attacks during lock file creation"
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}

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.

Action not permitted

SUSE-SU-2026:0082-1

CVE-2025-68146 (GCVE-0-2025-68146)

Tags

Sightings

Nomenclature