Vulnerability-Lookup

SUSE-SU-2026:0335-1

Vulnerability from csaf_suse - Published: 2026-01-29 10:15 - Updated: 2026-01-29 10:15

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-2026-22701: Fixed TOCTOU race condition in SoftFileLock implementation of he filelock package (bsc#1256457)

Patchnames

SUSE-2026-335,SUSE-SLE-Module-Development-Tools-15-SP7-2026-335,SUSE-SLE-Module-Packagehub-Subpackages-15-SP7-2026-335

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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}

CVE-2026-22701 (GCVE-0-2026-22701)

Vulnerability from cvelistv5 – Published: 2026-01-10 05:59 – Updated: 2026-01-12 16:45

Title

filelock Time-of-Check-Time-of-Use (TOCTOU) Symlink Vulnerability in SoftFileLock

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.

Severity ?

5.3 (Medium)


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

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')
CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-367 - Time-of-check Time-of-use (TOCTOU) 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/commit/255ed0…	x_refsource_MISC
	https://github.com/tox-dev/filelock/commit/41b42d…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	tox-dev	filelock	Affected: < 3.20.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-22701",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-12T16:45:44.181459Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-12T16:45:50.638Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "filelock",
          "vendor": "tox-dev",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.20.3"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-362",
              "description": "CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-367",
              "description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-10T05:59:28.872Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tox-dev/filelock/security/advisories/GHSA-qmgc-5h2g-mvrw",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-qmgc-5h2g-mvrw"
        },
        {
          "name": "https://github.com/tox-dev/filelock/commit/255ed068bc85d1ef406e50a135e1459170dd1bf0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/tox-dev/filelock/commit/255ed068bc85d1ef406e50a135e1459170dd1bf0"
        },
        {
          "name": "https://github.com/tox-dev/filelock/commit/41b42dd2c72aecf7da83dbda5903b8087dddc4d5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/tox-dev/filelock/commit/41b42dd2c72aecf7da83dbda5903b8087dddc4d5"
        }
      ],
      "source": {
        "advisory": "GHSA-qmgc-5h2g-mvrw",
        "discovery": "UNKNOWN"
      },
      "title": "filelock Time-of-Check-Time-of-Use (TOCTOU) Symlink Vulnerability in SoftFileLock"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-22701",
    "datePublished": "2026-01-10T05:59:28.872Z",
    "dateReserved": "2026-01-08T19:23:09.856Z",
    "dateUpdated": "2026-01-12T16:45:50.638Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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-2026:0335-1

CVE-2026-22701 (GCVE-0-2026-22701)

Tags

Sightings

Nomenclature