Vulnerability-Lookup

CVE-2026-6686 (GCVE-0-2026-6686)

Vulnerability from cvelistv5 – Published: 2026-07-01 13:55 – Updated: 2026-07-01 15:05

Title

FatFs Use of Uninitialized Clusters After Seek Past EOF

Summary

FatFs R0.16 and earlier contains an uninitialized cluster exposure when f_lseek() extends files beyond EOF without zero-filling newly allocated clusters. This maps to CWE-908 (Use of Uninitialized Resource). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (4.6, Medium). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.

Severity

4.6 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-01 15:05 UTC

CWE

CWE-908 - Use of uninitialized resource

Assigner

runZero icscert root

References

4 references

URL	Tags
https://www.runzero.com/blog/fatfs-bugs/	third-party-advisory
https://github.com/runZeroInc/vulns-2026-fatfs-chance	technical-description
https://elm-chan.org/fsw/ff/	product
https://www.runzero.com/advisories/fatfs-uninit-c…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
ChaN	FatFs	Affected: 0 , ≤ R0.16 (custom)	guessed

Date Public

2026-07-01 13:00

Credits

HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-6686

Vulnerability from fkie_nvd - Published: 2026-07-01 15:17 - Updated: 2026-07-02 14:38

Severity

4.6 (Medium) - CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
44488dab-36db-4358-99f9-bc116477f914	https://elm-chan.org/fsw/ff/	Product
44488dab-36db-4358-99f9-bc116477f914	https://github.com/runZeroInc/vulns-2026-fatfs-chance	Third Party Advisory, Exploit
44488dab-36db-4358-99f9-bc116477f914	https://www.runzero.com/advisories/fatfs-uninit-cluster-exposure-cve-2026-6686/	Third Party Advisory
44488dab-36db-4358-99f9-bc116477f914	https://www.runzero.com/blog/fatfs-bugs/	Third Party Advisory, Exploit
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/runZeroInc/vulns-2026-fatfs-chance	Third Party Advisory, Exploit

Impacted products

	Vendor	Product	Version
	elm-chan	fatfs	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "FatFs",
          "vendor": "ChaN",
          "versions": [
            {
              "lessThanOrEqual": "R0.16",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "44488dab-36db-4358-99f9-bc116477f914"
    }
  ],
  "configurations": [
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              "versionEndIncluding": "r0.16",
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          "negate": false,
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  ],
  "cveTags": [],
  "descriptions": [
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      "lang": "en",
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    }
  ],
  "id": "CVE-2026-6686",
  "lastModified": "2026-07-02T14:38:35.823",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "PHYSICAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.6,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
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          "userInteraction": "NONE",
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GHSA-H94P-VJQX-V7RR

Vulnerability from github – Published: 2026-07-01 15:35 – Updated: 2026-07-01 15:35

Details

Severity

4.6 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-6686"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-908"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-01T15:17:12Z",
    "severity": "MODERATE"
  },
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  "id": "GHSA-h94p-vjqx-v7rr",
  "modified": "2026-07-01T15:35:21Z",
  "published": "2026-07-01T15:35:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6686"
    },
    {
      "type": "WEB",
      "url": "https://elm-chan.org/fsw/ff"
    },
    {
      "type": "WEB",
      "url": "https://github.com/runZeroInc/vulns-2026-fatfs-chance"
    },
    {
      "type": "WEB",
      "url": "https://www.runzero.com/advisories/fatfs-uninit-cluster-exposure-cve-2026-6686"
    },
    {
      "type": "WEB",
      "url": "https://www.runzero.com/blog/fatfs-bugs"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2026-6686 (GCVE-0-2026-6686)

FKIE_CVE-2026-6686

GHSA-H94P-VJQX-V7RR

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Related by attack behaviour