CVE-2026-112912 filelock: Symlink swap during SoftFileLock's writability check leaks whether a path exists and is writable by the lock taker

filelock is a platform-independent file lock for Python. From 3.32.6 until 4.2.1, SoftFileLock can follow a swapped symbolic link during the conditional os.access writability check for a node without its owner-write bit, allowing another local user on a platform and directory configuration that...

CVE-2026-112912

The filelock Python library (versions 3.32.6 until 4.2.1) is vulnerable to a symlink swap during the SoftFileLock writability check. An attacker can manipulate symbolic links to cause the os.access check to follow a swapped link for a node lacking the owner-write bit. This allows a local user to ...

CVE-2026-112912 filelock: Symlink swap during SoftFileLock's writability check leaks whether a path exists and is writable by the lock taker

filelock is a platform-independent file lock for Python. From 3.32.6 until 4.2.1, SoftFileLock can follow a swapped symbolic link during the conditional os.access writability check for a node without its owner-write bit, allowing another local user on a platform and directory configuration that...

CVE-2026-112912 filelock: Symlink swap during SoftFileLock's writability check leaks whether a path exists and is writable by the lock taker

filelock is a platform-independent file lock for Python. From 3.32.6 until 4.2.1, SoftFileLock can follow a swapped symbolic link during the conditional os.access writability check for a node without its owner-write bit, allowing another local user on a platform and directory configuration that...

CVE-2026-112912

filelock is a platform-independent file lock for Python. From 3.32.6 until 4.2.1, SoftFileLock can follow a swapped symbolic link during the conditional os.access writability check for a node without its owner-write bit, allowing another local user on a platform and directory configuration that...

CVE-2026-112911 filelock: StrictSoftFileLock and SoftReadWriteLock adopt a protocol directory another user created first, losing mutual exclusion

filelock is a platform-independent file lock for Python. From 3.30.0 until 4.2.1, StrictSoftFileLock versions from 3.30.0 and SoftReadWriteLock versions from 4.0.0 can adopt a protocol directory created first by another local user in a shared parent directory, allowing that user to alter protocol...

CVE-2026-112911

The filelock Python library contains a vulnerability where StrictSoftFileLock (versions 3.30.0 to 4.2.1) and SoftReadWriteLock (versions 4.0.0 to 4.2.1) can adopt a protocol directory created by another local user within a shared parent directory. This allows a malicious local user to alter the p...

CVE-2026-112911

filelock is a platform-independent file lock for Python. From 3.30.0 until 4.2.1, StrictSoftFileLock versions from 3.30.0 and SoftReadWriteLock versions from 4.0.0 can adopt a protocol directory created first by another local user in a shared parent directory, allowing that user to alter protocol...

CVE-2026-112911 filelock: StrictSoftFileLock and SoftReadWriteLock adopt a protocol directory another user created first, losing mutual exclusion

filelock is a platform-independent file lock for Python. From 3.30.0 until 4.2.1, StrictSoftFileLock versions from 3.30.0 and SoftReadWriteLock versions from 4.0.0 can adopt a protocol directory created first by another local user in a shared parent directory, allowing that user to alter protocol...

CVE-2026-112911

filelock is a platform-independent file lock for Python. From 3.30.0 until 4.2.1, StrictSoftFileLock versions from 3.30.0 and SoftReadWriteLock versions from 4.0.0 can adopt a protocol directory created first by another local user in a shared parent directory, allowing that user to alter protocol...

atsfill (>=0.0.4.dev96, <=0.0.8.dev229), displayrws (>=0.1.3, <=0.1.4) +16 more potentially affected by CVE-2026-112911 via filelock (>=4.0.0, <=4.2.0)

filelock PYPI version =4.0.0, =0.0.4.dev96, =0.1.3, =5.4.2, =2026.10.0b1, =0.10.43, =0.10.43, =7.48.17, =0.10.43, =1.2.7, =0.2.1, =0.3.0, =2.2.0, =0.1.0, =0.1.2 and more Source cves: CVE-2026-112911 Source advisory: MEND:CVE-2026-112911...

CVE-2026-112911 filelock: StrictSoftFileLock and SoftReadWriteLock adopt a protocol directory another user created first, losing mutual exclusion

filelock is a platform-independent file lock for Python. From 3.30.0 until 4.2.1, StrictSoftFileLock versions from 3.30.0 and SoftReadWriteLock versions from 4.0.0 can adopt a protocol directory created first by another local user in a shared parent directory, allowing that user to alter protocol...

CVE-2026-112909

The filelock Python library contains a vulnerability in UnixFileLock prior to version 4.2.1 . A local user can cause the library to truncate or change the mode of a regular file if that file is renamed or hard-linked onto the lock path by another user (who has rename permissions or a permissive h...

CVE-2026-112909

filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected...

atsfill (>=0.0.4.dev96, <=0.0.8.dev229), displayrws (>=0.1.3, <=0.1.4) +16 more potentially affected by CVE-2026-112909 via filelock (>=4.0.0, <=4.2.0)

filelock PYPI version =4.0.0, =0.0.4.dev96, =0.1.3, =5.4.2, =2026.10.0b1, =0.10.43, =0.10.43, =7.48.17, =0.10.43, =1.2.7, =0.2.1, =0.3.0, =2.2.0, =0.1.0, =0.1.2 and more Source cves: CVE-2026-112909 Source advisory: MEND:CVE-2026-112909...

CVE-2026-112909 filelock: UnixFileLock truncates and chmods any regular file another user renames or hard-links onto the lock path

filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected...

CVE-2026-112909

filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected...

CVE-2026-112909 filelock: UnixFileLock truncates and chmods any regular file another user renames or hard-links onto the lock path

filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected...

CVE-2026-112909 filelock: UnixFileLock truncates and chmods any regular file another user renames or hard-links onto the lock path

filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected...

CVE-2026-112909

filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected...