Description
filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock versions from 4.1.0 can reuse a stale observation when an attacker pre-dates and removes its own marker, at least two lock-user processes are waiting, coarse or matching modification times preserve the observation, and an honest contender creates a fresh marker on the reused inode, causing that live marker to be removed as stale. This issue is fixed in version 4.2.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| tox-dev | filelock | >= 4.1.0, < 4.2.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | python-filelock | 4.2.8-1 | — |
| Debian 13 | python-filelock | No fix yet | — |
| Debian 12 | python-filelock | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | python-filelock | No fix yet | — |
| Ubuntu 26.04 LTS | python-filelock | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | python-filelock | No fix yet | — |
| Ubuntu Pro 22.04 LTS | python-filelock | No fix yet | — |
| Ubuntu Pro 20.04 LTS | python-filelock | No fix yet | — |
| Ubuntu Pro 18.04 LTS | python-filelock | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | py3.10-filelock | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | filelock | >= 4.1.0, < 4.2.1 | 4.2.1 | GHSA-2g95-wg33-c5x2 |