vulnerability · Mon 05 Oct 2026 · 22:53 UTC
GHSA-27vj-qcqg-25rc: fsspec: Server-Side Template Injection in ReferenceFileSystem leads to Remote Code Execution
Filed UTCSource GTH ↗
fsspec.implementations.reference.ReferenceFileSystem parses a "references" JSON document (Kerchunk format) supplied either inline or via a URL. The parser renders fields from this JSON through un-sandboxed jinja2.Template(...).render(...) calls in three locations. An attacker who controls the JSON document — typically by hosting it at a URL that the victim opens with fsspec.filesystem("reference", fo=URL) or via xarray.open_dataset("reference://...") — achieves arbitrary Python code execution on the victim machine, before any data is read. …
Signals
as the pipeline stamped them- High
- High-risk vulnerability — CVSS 8.8
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-104851 | — | 0.32% | NVD ↗ |
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