filelock: SoftReadWriteLock follows a lock tree swapped in after its first acquire and writes lock records into directories of the user running the lock

影響: pip:filelock >= 4.1.0, <= 4.2.0 → 4.2.1

SoftReadWriteLock (and AsyncSoftReadWriteLock, which wraps one) checks once per lock object, by name, that .rw, .rw/gen and .rw/holders are real directories and not symbolic links (files that redirect to another path). It then keeps only a boolean. Every later record operation resolves the full path again, and O_NOFOLLOW (a flag that makes an open fail when the final name is a symbolic link) protects the last component only. Another local user (the other user below) who can write the directory…

在 GitHub Advisory Database 阅读

2026/10/29 06:09，GitHub Advisory Database 发布了“filelock: SoftReadWriteLock follows a lock tree swapped in after its first acquire and writes lock records into directories of the user running the lock”（类型：漏洞公告）。严重程度为“低危”（low）。相关技术：Python。CVE：CVE-2026-112941。