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

Beschreibung

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 follows the link to infer whether a chosen path exists and is writable from the observable acquisition result. This issue is fixed in version 4.2.1.

Daten: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Wiedergegeben wie in der Quelle, auf Englisch.

Betroffene Produkte und Versionen

Referenzen und Patches

• https://github.com/tox-dev/filelock/security/advisories/GHSA-9j6q-wvj5-jgjg ExploitMitigationPatchVendor Advisory
• https://github.com/tox-dev/filelock/pull/835 Patch
• https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a Patch
• https://github.com/tox-dev/filelock/releases/tag/4.2.1 Release Notes