{"schemaVersion":3,"id":"CVE-2026-112912","aliases":["DEBIAN-CVE-2026-112912"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-10-20T14:23:18.993Z","modified":"2026-10-20T15:37:56.208Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":2.5,"severity":"low","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":2.5,"severity":"low","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":2.5,"severity":"low","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-59","name":"Improper Link Resolution Before File Access ('Link Following')","description":"The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/59.html"}],"affected":[{"vendor":"debian","product":"python-filelock","name":"python-filelock","label":"python-filelock","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/python-filelock","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"tox-dev","product":"filelock","name":"filelock","label":"filelock","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.32.6, < 4.2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.32.6, < 4.2.1","eol":null,"hubHref":"/vendor/tox-dev/filelock"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-9j6q-wvj5-jgjg","label":"github.com/tox-dev/filelock/security/advisories/GHSA-9j6q-wvj5-jgjg","hostname":"github.com","tags":["X Refsource CONFIRM"]},{"url":"https://github.com/tox-dev/filelock/pull/835","label":"github.com/tox-dev/filelock/pull/835","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a","label":"github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","label":"github.com/tox-dev/filelock/releases/tag/4.2.1","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-112912","label":"security-tracker.debian.org/tracker/CVE-2026-112912","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-20T14:23:18.993Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-20T15:37:56.208Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":10,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T00:06:25.563Z","stale":false,"partial":false}}