CVE-2026-112910
Dashboard / Vulnerabilities / CVE-2026-112910
Summary: filelock: WindowsFileLock ignores mode: a 0o600 lock file and the ReadWriteLock database inherit the directory ACL
Details: filelock is a platform-independent file lock for Python. From 3.10.0 until 4.2.1, filelock on Windows ignores the mode argument for WindowsFileLock files and the ReadWriteLock SQLite database. A lock created with mode=0o600 receives the parent directory's inheritable ACL because _open_non_reparse_fd and _nt_open do not create an owner-only security descriptor. Another local account with inherited access can read holder metadata or the lock database, modify those files where the ACL permits writes, or take the byte-range lock after release and delay later acquisitions. UnixFileLock is not affected, and mutual exclusion between cooperating processes continues to hold. This issue is fixed in version 4.2.1.
References: https://github.com/tox-dev/filelock/releases/tag/4.2.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112910.json, https://github.com/tox-dev/filelock/security/advisories/GHSA-8mx5-7m5m-r77g, https://nvd.nist.gov/vuln/detail/CVE-2026-112910, https://github.com/tox-dev/filelock/commit/72786d41aa25159ad28c1bcf4291738b135b2c6c, https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a, https://github.com/tox-dev/filelock/pull/835
Affected packages
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