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CVE-2026-112915— filelock ReadWriteLock: a crafted lock database makes every acquire stall or hang regardless of timeout

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 文件锁工具。在 3.20.4 至 4.2.1 版本中，ReadWriteLock 在打开经过特制的 SQLite 锁数据库时，未对数据库架构和查询操作施加限制。这允许同一机器上的其他本地用户通过替换该数据库，导致锁的获取过程停滞或挂起。其中，3.20.4 版本在每次实例首次打开时暴露此问题，而 3.30.0 及后续版本则会在每次获取锁时重复暴露该漏洞。该问题已在 4.2.1 版本中修复。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499.006
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I. Basic Information for CVE-2026-112915

Vulnerability Information
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Vulnerability Title
filelock ReadWriteLock: a crafted lock database makes every acquire stall or hang regardless of timeout
Source: CVE Program / CVE List V5
Vulnerability Description
filelock is a platform-independent file lock for Python. From 3.20.4 until 4.2.1, ReadWriteLock can open a crafted SQLite lock database without bounding schema and query work, allowing another local user who can replace the database to make acquisition stall or hang; versions from 3.20.4 expose this on initial per-instance opening, and versions from 3.30.0 repeat the exposure on every acquisition. This issue is fixed in version 4.2.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tox-dev filelock >= 3.20.4, < 4.2.1 -

II. Public POCs for CVE-2026-112915

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III. Intelligence Information for CVE-2026-112915

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Other References for CVE-2026-112915 (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-2026-112914 5.3 MEDIUM filelock: SoftFileLock stale-break restore follows a swapped-in symbolic link and hard-lin
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-400

V. Comments for CVE-2026-112915

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