filelock is a platform-independent file lock for Python. From 3.32.6 until 4.2.1, SoftFileLock can follow a swapped symbolic link during the conditional os.access writability check for a node without its owner-write bit, allowing another local user on a platform and directory configuration that follows the link to infer whether a chosen path exists and is writable from the observable acquisition result. This issue is fixed in version 4.2.1.
Metrics
Affected Vendors & Products
References
History
Wed, 21 Oct 2026 21:30:00 +0000
| Type | Values Removed | Values Added |
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| CPEs | cpe:2.3:a:tox-dev:filelock:*:*:*:*:*:python:*:* |
Wed, 21 Oct 2026 00:30:00 +0000
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threat_severity
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threat_severity
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Tue, 20 Oct 2026 16:45:00 +0000
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| First Time appeared |
Tox-dev
Tox-dev filelock |
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| Vendors & Products |
Tox-dev
Tox-dev filelock |
Tue, 20 Oct 2026 16:30:00 +0000
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ssvc
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Tue, 20 Oct 2026 14:45:00 +0000
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| Description | filelock is a platform-independent file lock for Python. From 3.32.6 until 4.2.1, SoftFileLock can follow a swapped symbolic link during the conditional os.access writability check for a node without its owner-write bit, allowing another local user on a platform and directory configuration that follows the link to infer whether a chosen path exists and is writable from the observable acquisition result. This issue is fixed in version 4.2.1. | |
| Title | filelock: Symlink swap during SoftFileLock's writability check leaks whether a path exists and is writable by the lock taker | |
| Weaknesses | CWE-59 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-10-20T14:23:18.993Z
Updated: 2026-10-20T15:37:56.208Z
Reserved: 2026-10-19T20:16:09.858Z
Link: CVE-2026-112912
Updated: 2026-10-20T15:37:49.246Z
Status : Analyzed
Published: 2026-10-20T15:17:15.657
Modified: 2026-10-21T21:18:18.623
Link: CVE-2026-112912