filelock: StrictSoftFileLock creates its claim directories without the lock mode, so another local user with a write bit on them can end a live hold

影響: pip:filelock >= 3.30.0, <= 4.2.0 → 4.2.1

StrictSoftFileLock and AsyncStrictSoftFileLock apply the caller's mode to the sentinel (the lock file at ) and to both claim files (the files whose presence says a process wants or holds the lock). They create the two directories that hold the claims, .filelock and .filelock/claims, with a bare mkdir(). That gives 0o777 filtered through the umask (a per-process mask that removes permission bits from new files and directories) or, under a parent with a default ACL (an access control list on a di…

GitHub Advisory Databaseで読む

2026/10/29 06:09、GitHub Advisory Databaseが「filelock: StrictSoftFileLock creates its claim directories without the lock mode, so another local user with a write bit on them can end a live hold」を公開しました (種別: 脆弱性アドバイザリ)。重大度は「警告」(medium) です。関連する技術: Python。CVE: CVE-2026-112908。