# fsspec (PyPI) vulnerabilities

1 known vulnerability (1 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 2026.9.0 (Sep 18, 2026): no advisory affects it
- Newest unaffected release: 2026.9.0 (Sep 18, 2026), the latest release
- Weekly downloads: 135.2M
- Dependents: 48K
- Releases: 102 since 0.1.0 (Jan 2, 2019)
- Registry: https://pypi.org/project/fsspec/
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-104851: 0.9.0 to 2026.4.0 (2026.6.0 is outside it)

## Advisories (1)

### [CVE-2026-104851](https://cve.now/CVE-2026-104851): fsspec: Server-Side Template Injection in ReferenceFileSystem leads to Remote Code Execution

- Severity: High 8.8
- Published: Oct 2, 2026
- Affected: from 0.9.0, fixed in 2026.6.0.
- Fixed in 2026.6.0 (released Jun 16, 2026, 108 days before disclosure).
- The latest release, 2026.9.0, is not affected.

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