CVE-2026-112940
Reported by github_m · Published October 20, 2026
filelock is a platform-independent file lock for Python. From 3.20.4 until 4.2.1, ReadWriteLock let SQLite reopen the database and side files by name; on POSIX systems an attacker with rename access in a non-sticky parent can swap those names to cause overwrite or unlink operations, while a writable adjacent hot journal is additionally required for attacker-chosen content overwrites. This issue is fixed in version 4.2.1.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| py3-cassandra-medusa | Wolfi | 0.31.0-r3 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| tox-dev | filelock | >= 3.20.4, < 4.2.1 |
| wolfi | py3-cassandra-medusa | 0 |
| tox-dev | filelock | 3.20.4 |
| chainguard | openstack-rally-2025.2 | 0 |
| chainguard | airflow-3 | 0 |
| PyPI | filelock | 3.20.4 |
| wolfi | open-webui | 0 |
| chainguard | openstack-rally-2026.1 | 0 |
| tox-dev | filelock | |
| chainguard | datahub-ingestion | 0 |
| chainguard | request-1276 | 0 |
| chainguard | ray | 0 |
| chainguard | datahub-ingestion-fips | 0 |
| chainguard | dbt-snowflake | 0 |
Timeline
- Oct 20, 2026 CVE Published
- Oct 21, 2026 EPSS Score (4 in total, the first dated here)
- Oct 23, 2026 CVE Updated
- Oct 30, 2026 Security Advisory
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2026-112940
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curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-112940/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- https://github.com/tox-dev/filelock/security/advisories/GHSA-v4x8-3wr5-3wq8 x_refsource_CONFIRM
- https://github.com/tox-dev/filelock/pull/834 x_refsource_MISC
- https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2d x_refsource_MISC
- https://github.com/tox-dev/filelock/releases/tag/4.2.1 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-112940 advisory
- https://github.com/advisories/GHSA-v4x8-3wr5-3wq8 advisory