CVE-2026-22701

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Source
https://nvd.nist.gov/vuln/detail/CVE-2026-22701
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-22701.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-22701
Aliases
Downstream
Related
Published
2026-01-10T05:59:28.872Z
Modified
2026-01-15T05:55:54.824990Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
Summary
filelock Time-of-Check-Time-of-Use (TOCTOU) Symlink Vulnerability in SoftFileLock
Details

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 raiseonnotwritable_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.

Database specific 
{
    "cwe_ids": [
        "CWE-362",
        "CWE-367",
        "CWE-59"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22701.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/tox-dev/filelock

Affected ranges

Type
GIT
Repo
https://github.com/tox-dev/filelock
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
41b42dd2c72aecf7da83dbda5903b8087dddc4d5

Affected versions

3.*

3.1.0
3.10.0
3.10.1
3.10.2
3.10.3
3.10.4
3.10.5
3.10.6
3.10.7
3.11.0
3.12.0
3.12.1
3.12.2
3.12.3
3.12.4
3.13.0
3.13.1
3.13.2
3.13.3
3.13.4
3.14.0
3.15.0
3.15.1
3.15.2
3.15.3
3.15.4
3.16.0
3.16.1
3.17.0
3.18.0
3.19.0
3.19.1
3.2.0
3.2.1
3.20.0
3.20.1
3.20.2
3.3.0
3.3.1
3.3.2
3.4.0
3.4.1
3.4.2
3.5.0
3.5.1
3.6.0
3.7.0
3.7.1
3.8.0
3.8.1
3.8.2
3.9.0
3.9.1

v1.*

v1.0.0
v1.0.1
v1.0.2
v1.0.3

v2.*

v2.0.0
v2.0.1
v2.0.10
v2.0.11
v2.0.12
v2.0.13
v2.0.2
v2.0.3
v2.0.4
v2.0.5
v2.0.6
v2.0.7
v2.0.8
v2.0.9

v3.*

v3.0.0
v3.0.1
v3.0.10
v3.0.12
v3.0.3
v3.0.4
v3.0.5
v3.0.6
v3.0.7
v3.0.8
v3.0.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-22701.json"