Arbitrary Code Injection Affecting fsspec package, versions [,2026.6.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-FSSPEC-20419437
- published4 Oct 2026
- disclosed2 Oct 2026
- creditDanyAssuid
Introduced: 2 Oct 2026
NewCVE-2026-104851 (opens in a new tab)How to fix?
Upgrade fsspec to version 2026.6.0 or higher.
Overview
fsspec is a File-system specification
Affected versions of this package are vulnerable to Arbitrary Code Injection in the reference filesystem process. An attacker can execute arbitrary code by tricking an application into loading a maliciously crafted reference document, such as a Kerchunk metadata file, which leads to unrestricted template evaluation and execution of embedded expressions in the context of the running process.