HIGHpublic-safe

CVE-2026-104851

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

CVSS
8.8 Severity
HIGH EPSS
0.0032 (23) KEV
-

Source-published summary

Possible impact

Source describes code execution review. Possible impact: An attacker may be able to run code or commands on affected systems.

Affected context

Affected product or version requires source confirmation.

Remediation / advisory

Patch confirmed by source text; fixed version context: 2026.6.0..

Why it matters

Source describes code execution review. Possible impact: An attacker may be able to run code or commands on affected systems.; CVSS 8.8 (HIGH); EPSS percentile 23; not listed in KEV; Patch confirmed by source text; fixed version context: 2026.6.0; sources: NVD, OSV.

What to verify

Confirm affected product/version, vendor advisory, patch or mitigation, and exposure.

Exposure hint

exposure unknown

Impact tags

code execution review

Urgency reasons

CVSS HIGHvendor advisory presentrecent updateremediation reference present

Source-derived note

Summary derived from NVD / OSV description; unsafe procedural detail is not shown.

Redaction metadata

source summary used: True
fallback summary used: False
unsafe procedural detail present: false
raw source displayed: false
public summary redacted: true

Remediation handoff

Public-safe static handoff for human/Codex remediation planning. Scan, patch, external execution, and auto remediation are disabled.

Handoff JSON Handoff Markdown Safe Codex prompt

Safety note

This radar shows source-published defensive context only. Exploit procedures, exploit strings, scanner commands, and auto-remediation are not provided.