{"items":[{"id":"NVI-00008945","kind":"vulnerability","title":"filelock: Symlink swap during SoftFileLock's writability check leaks whether a path exists and is writable by the lock taker","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-9j6q-wvj5-jgjg","CVE-2026-112912"],"plain_summary":"GitHub lists this reviewed advisory for filelock. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-5fbfa4f0afdc18c465c569a7c0fc3408"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-28T21:08:42.000Z","value":"2.5 low","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-42e7236bdd3e68a3a16597bd04da0de9"},{"kind":"CVSS","as_of":"2026-10-21T21:18:18.623Z","value":"2.5 LOW (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-2000555796e3670b59ee34b541808e4d"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.213%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.11678. Missing scores are unknown.","source_id":"sr-5fbfa4f0afdc18c465c569a7c0fc3408"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-42e7236bdd3e68a3a16597bd04da0de9","url":"https://github.com/advisories/GHSA-9j6q-wvj5-jgjg","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-9j6q-wvj5-jgjg","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:08.420Z"},{"id":"sr-2000555796e3670b59ee34b541808e4d","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112912","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-112912","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-03T09:58:44.915Z"},{"id":"sr-5fbfa4f0afdc18c465c569a7c0fc3408","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-112912","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.374Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-42e7236bdd3e68a3a16597bd04da0de9"],"technology":"filelock","known_exclusions":[],"conditions_summary":"`raise_on_not_writable_file()` is the check that `SoftFileLock` and the locks sharing its acquire path run before every attempt. It looks at the lock path with `os.lstat`, so that it judges a planted symlink (a file that points at another path) by itself. When the node has no owner-write bit, it then calls `os.access(filename, os.W_OK)`, which follows symlinks. A local user who can create entries in the lock's directory can swap the path between a mode-`0466` file and a symlink to a path of their choosing. The second call then reports on the symlink's target with the permissions of the user running the lock (below: the lock user). The lock user's `acquire()` ends in `PermissionError` within a fraction of a second when the target is missing or not writable by the lock user, and in the ordinary `Timeout` otherwise.\n\nThat yields one bit per watched acquire. The bit says whether a path exists and is writable by the lock taker. It covers paths under directories the other user cannot search, or any path when root takes the lock. The lock does not open, create or modify anything through the symlink. On Linux, `fs.protected_symlinks` (a kernel setting that refuses to follow another user's ","public_affected_ranges":[">= 3.32.6, <= 4.2.0"]}],"null_published_at":"2026-11-03T10:03:31.378Z","source_updated_at":"2026-10-28T21:08:42.000Z","source_disclosed_at":"2026-10-28T21:08:40.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:56:08.420Z"},{"id":"NVI-00008945","kind":"vulnerability","title":"filelock: Symlink swap during SoftFileLock's writability check leaks whether a path exists and is writable by the lock taker","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-9j6q-wvj5-jgjg","CVE-2026-112912"],"plain_summary":"GitHub lists this reviewed advisory for filelock. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-5fbfa4f0afdc18c465c569a7c0fc3408"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-28T21:08:42.000Z","value":"2.5 low","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-42e7236bdd3e68a3a16597bd04da0de9"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.213%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.11678. Missing scores are unknown.","source_id":"sr-5fbfa4f0afdc18c465c569a7c0fc3408"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-42e7236bdd3e68a3a16597bd04da0de9","url":"https://github.com/advisories/GHSA-9j6q-wvj5-jgjg","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-9j6q-wvj5-jgjg","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:08.420Z"},{"id":"sr-5fbfa4f0afdc18c465c569a7c0fc3408","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-112912","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.374Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-42e7236bdd3e68a3a16597bd04da0de9"],"technology":"filelock","known_exclusions":[],"conditions_summary":"`raise_on_not_writable_file()` is the check that `SoftFileLock` and the locks sharing its acquire path run before every attempt. It looks at the lock path with `os.lstat`, so that it judges a planted symlink (a file that points at another path) by itself. When the node has no owner-write bit, it then calls `os.access(filename, os.W_OK)`, which follows symlinks. A local user who can create entries in the lock's directory can swap the path between a mode-`0466` file and a symlink to a path of their choosing. The second call then reports on the symlink's target with the permissions of the user running the lock (below: the lock user). The lock user's `acquire()` ends in `PermissionError` within a fraction of a second when the target is missing or not writable by the lock user, and in the ordinary `Timeout` otherwise.\n\nThat yields one bit per watched acquire. The bit says whether a path exists and is writable by the lock taker. It covers paths under directories the other user cannot search, or any path when root takes the lock. The lock does not open, create or modify anything through the symlink. On Linux, `fs.protected_symlinks` (a kernel setting that refuses to follow another user's ","public_affected_ranges":[">= 3.32.6, <= 4.2.0"]}],"null_published_at":"2026-11-01T01:45:38.532Z","source_updated_at":"2026-10-28T21:08:42.000Z","source_disclosed_at":"2026-10-28T21:08:40.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:56:08.420Z"},{"id":"NVI-00008945","kind":"vulnerability","title":"filelock: Symlink swap during SoftFileLock's writability check leaks whether a path exists and is writable by the lock taker","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-9j6q-wvj5-jgjg","CVE-2026-112912"],"plain_summary":"GitHub lists this reviewed advisory for filelock. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-42e7236bdd3e68a3a16597bd04da0de9"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-28T21:08:42.000Z","value":"2.5 low","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-42e7236bdd3e68a3a16597bd04da0de9"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-42e7236bdd3e68a3a16597bd04da0de9","url":"https://github.com/advisories/GHSA-9j6q-wvj5-jgjg","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-9j6q-wvj5-jgjg","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:08.420Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-42e7236bdd3e68a3a16597bd04da0de9"],"technology":"filelock","known_exclusions":[],"conditions_summary":"`raise_on_not_writable_file()` is the check that `SoftFileLock` and the locks sharing its acquire path run before every attempt. It looks at the lock path with `os.lstat`, so that it judges a planted symlink (a file that points at another path) by itself. When the node has no owner-write bit, it then calls `os.access(filename, os.W_OK)`, which follows symlinks. A local user who can create entries in the lock's directory can swap the path between a mode-`0466` file and a symlink to a path of their choosing. The second call then reports on the symlink's target with the permissions of the user running the lock (below: the lock user). The lock user's `acquire()` ends in `PermissionError` within a fraction of a second when the target is missing or not writable by the lock user, and in the ordinary `Timeout` otherwise.\n\nThat yields one bit per watched acquire. The bit says whether a path exists and is writable by the lock taker. It covers paths under directories the other user cannot search, or any path when root takes the lock. The lock does not open, create or modify anything through the symlink. On Linux, `fs.protected_symlinks` (a kernel setting that refuses to follow another user's ","public_affected_ranges":[">= 3.32.6, <= 4.2.0"]}],"null_published_at":"2026-10-31T22:13:27.123Z","source_updated_at":"2026-10-28T21:08:42.000Z","source_disclosed_at":"2026-10-28T21:08:40.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:56:08.420Z"}],"next_cursor":null,"snapshot_revision":"42594"}