Vulnerability-Lookup

OPENSUSE-SU-2026:22028-1

Vulnerability from csaf_opensuse - Published: 2026-10-06 10:57 - Updated: 2026-10-08 18:03

Summary

Security update for python-fsspec

Severity

Important

Notes

Title of the patch: Security update for python-fsspec

Description of the patch: This update for python-fsspec fixes the following issues: Changes in python-fsspec: - CVE-2026-104851: python-fsspec: remote code execution via server-side template injection in `ReferenceFileSystem` (bsc#1284173)

Patchnames: openSUSE-Leap-16.0-packagehub-656

CVE-2026-104851

Affected products

Recommended 1 product

Product	Identifier	Version	Remediation
Unresolved product id: openSUSE Leap 16.0:python313-fsspec-0:2024.3.1-bp160.2.1.noarch		—	Vendor Fix

Threats

Impact important

References

6 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://bugzilla.suse.com/1284173	self
https://www.suse.com/security/cve/CVE-2026-104851/	self
https://www.suse.com/security/cve/CVE-2026-104851	external
https://bugzilla.suse.com/1284173	external

JSON

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}

CVE-2026-104851 (GCVE-0-2026-104851)

Vulnerability from cvelistv5 – Published: 2026-10-02 16:36 – Updated: 2026-10-05 20:03

Title

fsspec: Server-Side Template Injection in ReferenceFileSystem leads to Remote Code Execution

Summary

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.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-05 20:03 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')
CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8035 records in the last 180 days details

References

6 references

URL	Tags
https://github.com/fsspec/filesystem_spec/securit…	x_refsource_CONFIRM
https://github.com/fsspec/filesystem_spec/pull/2029	x_refsource_MISC
https://github.com/fsspec/filesystem_spec/pull/2039	x_refsource_MISC
https://github.com/fsspec/filesystem_spec/commit/…	x_refsource_MISC
https://github.com/fsspec/filesystem_spec/commit/…	x_refsource_MISC
https://github.com/fsspec/filesystem_spec/release…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
fsspec	filesystem_spec	Affected: >= 0.9.0, < 2026.6.0

Show details on NVD website

JSON

To clipboard

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  "containers": {
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      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-104851",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-05T20:03:10.746838Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-10-05T20:03:36.502Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            "tags": [
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            "url": "https://github.com/fsspec/filesystem_spec/security/advisories/GHSA-27vj-qcqg-25rc"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "product": "filesystem_spec",
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      ],
      "metrics": [
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          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
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            "userInteraction": "REQUIRED",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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