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CVE-2026-104851

8.8 · HIGH

fsspec is a specification and Python implementation framework for filesystem interfaces.

Published Oct 2, 2026CWE-94EPSS 0.47%

Overview

CVE-2026-104851 is a high-severity vulnerability. It was published on October 2, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

fsspec is a specification and Python implementation framework for filesystem interfaces. From 0.9.0 until 2026.6.0, fsspec.implementations.reference.ReferenceFileSystem evaluates fields from Kerchunk reference JSON documents through unrestricted jinja2.Template(...).render(...) calls in _process_references1._render_jinja, _process_templates, and _process_gen in fsspec/implementations/reference.py. A document supplied inline or fetched from an attacker-controlled URL can provide template expressions that execute Python code when the reference filesystem is opened, including through consumers such as xarray, before referenced data is read. The _process_gen path is reached whenever a document includes a gen array, while the other paths depend on template-related options and values. This issue is fixed in version 2026.6.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/fsspec/filesystem_spec/commit/86438783f93b1398ef245b92f0e6063b445b611cGitHubgithub.com/fsspec/filesystem_spec/commit/a1c16ab3f07f354aa371c38f7b1b07ea7fd4c5c8GitHubgithub.com/fsspec/filesystem_spec/pull/2029GitHubgithub.com/fsspec/filesystem_spec/pull/2039GitHubgithub.com/fsspec/filesystem_spec/releases/tag/2026.6.0GitHubgithub.com/fsspec/filesystem_spec/security/advisories/GHSA-27vj-qcqg-25rcGitHubgithub.com/fsspec/filesystem_spec/security/advisories/GHSA-27vj-qcqg-25rc

How CyberStrike helps

Frequently asked questions

What is CVE-2026-104851?

CVE-2026-104851 is a high-severity vulnerability. It was published on October 2, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-104851?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-104851?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-104851?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-104851 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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