CVE Watch5 oct 2026

CVE-2026-104851

fsspec is a specification and Python implementation framework for filesystem interfaces. From 0.9.0 until 2026.6.0, fsspec.implementations.r

CVSS

8.8

Alto

EPSS

0.3%

p23

KEV

—

Exploit Today

0-100

Publicado: 2 oct 2026 · Última mod.: 5 oct 2026 · CWE-94 · CWE-1336

EPSS · 30d

0.3%EPSS · 30 días0.3%

2026-10-032026-10-21

Descripción técnica

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.

Referencias oficiales

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