Vulnerability-Lookup

CVE-2026-68768 (GCVE-0-2026-68768)

Vulnerability from cvelistv5 – Published: 2026-08-22 14:12 – Updated: 2026-08-24 18:31

Title

hashcat through 7.1.2 Heap Buffer Overflow in outfile_write() via Oversized Username

Summary

hashcat contains a heap-based buffer overflow (out-of-bounds write) in the outfile_write() function in src/outfile.c. When assembling output into a fixed-size buffer (HCBUFSIZ_LARGE, ~16 MB), the function sequentially appends the username, separator, hash, and plaintext via memcpy without validating that the accumulated length stays within the buffer capacity. When run with --username --show against a crafted hash file containing an oversized username that nearly fills the buffer, the total assembled output exceeds the buffer, causing a heap buffer overflow that can corrupt memory and crash the process.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

6.1 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-24 18:31 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://github.com/hashcat/hashcat/issues/4740	issue-tracking
https://github.com/hashcat/hashcat	product
https://github.com/hashcat/hashcat/commit/68f56a2…	patch
https://github.com/hashcat/hashcat/blob/v7.1.2/sr…	technical-description
https://www.vulncheck.com/advisories/hashcat-thro…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
hashcat	hashcat	Affected: 0 , ≤ 7.1.2 (semver) cpe:2.3:a:hashcat:hashcat::::::::

Date Public

2026-07-31 00:00

Credits

Piotr Kowalczyk

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-68768

Vulnerability from fkie_nvd - Published: 2026-08-22 15:16 - Updated: 2026-08-24 19:16

Severity

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

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/hashcat/hashcat
	disclosure@vulncheck.com	https://github.com/hashcat/hashcat/blob/v7.1.2/src/outfile.c#L654-L668
	disclosure@vulncheck.com	https://github.com/hashcat/hashcat/commit/68f56a2d8712867a8520bf4dcf07f6145c23df89
	disclosure@vulncheck.com	https://github.com/hashcat/hashcat/issues/4740
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/hashcat-through-heap-buffer-overflow-in-outfile-write-via-oversized-username
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/hashcat/hashcat/issues/4740

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-68768",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-24T18:31:30.947115Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-22T15:16:20.903",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/hashcat/hashcat"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/hashcat/hashcat/blob/v7.1.2/src/outfile.c#L654-L668"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/hashcat/hashcat/commit/68f56a2d8712867a8520bf4dcf07f6145c23df89"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/hashcat/hashcat/issues/4740"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/hashcat-through-heap-buffer-overflow-in-outfile-write-via-oversized-username"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/hashcat/hashcat/issues/4740"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-120"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-CM34-RH84-36RF

Vulnerability from github – Published: 2026-08-22 15:31 – Updated: 2026-08-22 15:31

Details

Severity

6.1 (Medium)


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

6.9 (Medium)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-68768"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-120"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T15:16:20Z",
    "severity": "MODERATE"
  },
  "details": "hashcat contains a heap-based buffer overflow (out-of-bounds write) in the outfile_write() function in src/outfile.c. When assembling output into a fixed-size buffer (HCBUFSIZ_LARGE, ~16 MB), the function sequentially appends the username, separator, hash, and plaintext via memcpy without validating that the accumulated length stays within the buffer capacity. When run with --username --show against a crafted hash file containing an oversized username that nearly fills the buffer, the total assembled output exceeds the buffer, causing a heap buffer overflow that can corrupt memory and crash the process.",
  "id": "GHSA-cm34-rh84-36rf",
  "modified": "2026-08-22T15:31:04Z",
  "published": "2026-08-22T15:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68768"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hashcat/hashcat/issues/4740"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hashcat/hashcat/commit/68f56a2d8712867a8520bf4dcf07f6145c23df89"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hashcat/hashcat"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hashcat/hashcat/blob/v7.1.2/src/outfile.c#L654-L668"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/hashcat-through-heap-buffer-overflow-in-outfile-write-via-oversized-username"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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.

Action not permitted

CVE-2026-68768 (GCVE-0-2026-68768)

FKIE_CVE-2026-68768

GHSA-CM34-RH84-36RF

Tags

Sightings

Nomenclature