Vulnerability-Lookup

CVE-2026-6682 (GCVE-0-2026-6682)

Vulnerability from cvelistv5 – Published: 2026-07-01 13:36 – Updated: 2026-07-01 15:24

Title

FatFs Integer Overflow in FAT32 Volume Mount

Summary

In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs->n_fats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or Wraparound). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). Remote delivery is also possible in OTA/update pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.

Severity

7.6 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-01 15:23 UTC

CWE

CWE-190 - Integer overflow or wraparound

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-fat32-in…	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-2026-6682

Vulnerability from fkie_nvd - Published: 2026-07-01 15:17 - Updated: 2026-07-02 14:37

Severity

7.6 (High) - CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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-fat32-int-of-mnt-cve-2026-6682/	Third Party Advisory, Exploit
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

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      "source": "44488dab-36db-4358-99f9-bc116477f914",
      "tags": [
        "Third Party Advisory",
        "Exploit"
      ],
      "url": "https://www.runzero.com/blog/fatfs-bugs/"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Third Party Advisory",
        "Exploit"
      ],
      "url": "https://github.com/runZeroInc/vulns-2026-fatfs-chance"
    }
  ],
  "sourceIdentifier": "44488dab-36db-4358-99f9-bc116477f914",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ],
      "source": "44488dab-36db-4358-99f9-bc116477f914",
      "type": "Secondary"
    }
  ]
}

GHSA-C25X-VCG6-4CCX

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

Details

Severity

7.6 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-6682"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-01T15:17:12Z",
    "severity": "HIGH"
  },
  "details": "In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs-\u003en_fats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or Wraparound). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). Remote delivery is also possible in OTA/update pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.",
  "id": "GHSA-c25x-vcg6-4ccx",
  "modified": "2026-07-01T15:35:20Z",
  "published": "2026-07-01T15:35:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6682"
    },
    {
      "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-fat32-int-of-mnt-cve-2026-6682"
    },
    {
      "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:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

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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.
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Action not permitted

CVE-2026-6682 (GCVE-0-2026-6682)

FKIE_CVE-2026-6682

GHSA-C25X-VCG6-4CCX

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