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CVE-2026-112914— filelock: SoftFileLock stale-break restore follows a swapped-in symbolic link and hard-links a file of the user running the lock into the lock directory

Quick assessment

Affected
tox-dev filelock
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

filelock 是一个跨平台的 Python 文件锁库。在版本 4.1.0 至 4.2.1 期间，SoftFileLock 在将过期的标记文件移开后，会根据文件名将其恢复，这使得同一本地用户若拥有重命名权限且处于非粘滞（non-sticky）锁目录中，便可替换为一个符号链接；若运行时遵循该符号链接且目标位于同一文件系统中，则可能导致锁持有者将其某个文件硬链接到锁目录中。该问题已在版本 4.2.1 中修复。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1565.002 · Transmitted Data Manipulation
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I. Basic Information for CVE-2026-112914

Vulnerability Information
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Vulnerability Title
filelock: SoftFileLock stale-break restore follows a swapped-in symbolic link and hard-links a file of the user running the lock into the lock directory
Source: CVE Program / CVE List V5
Vulnerability Description
filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock can restore a stale marker by name after moving it aside, allowing another local user with rename access in a non-sticky lock directory to swap in a symbolic link and, on a runtime that follows the link and a same-filesystem target, make the lock user hard-link one of its files into the lock directory. This issue is fixed in version 4.2.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
允许符号链接跟随的竞争条件
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tox-dev filelock >= 4.1.0, < 4.2.1 -

II. Public POCs for CVE-2026-112914

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III. Intelligence Information for CVE-2026-112914

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Other References for CVE-2026-112914 (4)

Same Patch Batch · tox-dev · 2026-10-20 · 13 CVEs total

CVE-2026-112940 7.1 HIGH filelock ReadWriteLock: SQLite reopens the lock database by name, so a planted symlink or
CVE-2026-112911 6.3 MEDIUM filelock: StrictSoftFileLock and SoftReadWriteLock adopt a protocol directory another user
CVE-2026-112909 6.1 MEDIUM filelock: UnixFileLock truncates and chmods any regular file another user renames or hard-
CVE-2026-112934 6.1 MEDIUM filelock: SoftReadWriteLock holder refresh writes through a hard link and hangs on a named
CVE-2026-112936 6.1 MEDIUM filelock: ReadWriteLock follows a symlink at the lock path into SQLite
CVE-2026-112937 6.1 MEDIUM filelock: ReadWriteLock on the hard-link route deletes any directory another user renames
CVE-2026-112915 5.5 MEDIUM filelock ReadWriteLock: a crafted lock database makes every acquire stall or hang regardle
CVE-2026-112906 4.7 MEDIUM filelock: SoftFileLock evicts a fresh lock file whose watched age another local user's pre
CVE-2026-112935 4.7 MEDIUM filelock: SoftFileLock stale-lock break removes a live lock file on a reused inode number
CVE-2026-112939 4.7 MEDIUM filelock: SoftFileLock removes a live holder's marker when another user forges the PID in
CVE-2026-112941 3.3 LOW filelock: SoftReadWriteLock follows a lock tree swapped in after its first acquire and wri
CVE-2026-112912 2.5 LOW filelock: Symlink swap during SoftFileLock's writability check leaks whether a path exists

IV. Related Vulnerabilities

Same product: filelock
Same vendor: tox-dev
Same weakness: CWE-363

V. Comments for CVE-2026-112914

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