Vulnerability-Lookup

CVE-2026-68767 (GCVE-0-2026-68767)

Vulnerability from cvelistv5 – Published: 2026-08-22 14:12 – Updated: 2026-08-26 16:16

Title

hashcat through 7.1.2 Off-by-One Out-of-Bounds Heap Write in fgetl()

Summary

hashcat's fgetl() function in src/filehandling.c writes a null terminator one byte past the caller's buffer when an input line is exactly the buffer length. Attackers can trigger this out-of-bounds heap write by providing a hash file, potfile, or wordlist containing a line of exactly HCBUFSIZ_LARGE bytes.

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: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-26 15:55 UTC

CWE

CWE-193 - Off-by-one Error

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://github.com/hashcat/hashcat/issues/4739	issue-tracking
https://github.com/hashcat/hashcat	product
https://github.com/hashcat/hashcat/commit/93b55d3…	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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                "id": "CVE-2026-68767",
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FKIE_CVE-2026-68767

Vulnerability from fkie_nvd - Published: 2026-08-22 15:16 - Updated: 2026-08-26 17:17

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/filehandling.c#L1032-L1060
	disclosure@vulncheck.com	https://github.com/hashcat/hashcat/commit/93b55d37d3b2340013d4036f10181ddc67d44249
	disclosure@vulncheck.com	https://github.com/hashcat/hashcat/issues/4739
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/hashcat-through-off-by-one-out-of-bounds-heap-write-in-fgetl

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "hashcat",
          "vendor": "hashcat",
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    }
  ],
  "id": "CVE-2026-68767",
  "lastModified": "2026-08-26T17:17:09.923",
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    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/hashcat-through-off-by-one-out-of-bounds-heap-write-in-fgetl"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-VGV2-WHP7-2895

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-2026-68767"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-193"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T15:16:20Z",
    "severity": "MODERATE"
  },
  "details": "hashcat\u0027s fgetl() function in src/filehandling.c writes a null terminator one byte past the caller\u0027s buffer when an input line is exactly the buffer length. Attackers can trigger this out-of-bounds heap write by providing a hash file, potfile, or wordlist containing a line of exactly HCBUFSIZ_LARGE bytes.",
  "id": "GHSA-vgv2-whp7-2895",
  "modified": "2026-08-22T15:31:04Z",
  "published": "2026-08-22T15:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68767"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hashcat/hashcat/issues/4739"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hashcat/hashcat/commit/93b55d37d3b2340013d4036f10181ddc67d44249"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hashcat/hashcat"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hashcat/hashcat/blob/v7.1.2/src/filehandling.c#L1032-L1060"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/hashcat-through-off-by-one-out-of-bounds-heap-write-in-fgetl"
    }
  ],
  "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"
    }
  ]
}

ubuntu-cve-2026-68767

Vulnerability from osv_ubuntu

Published

2026-08-22 15:16

Modified

2026-09-02 16:23

Summary

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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-68767	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-68767	REPORT
	https://github.com/hashcat/hashcat/issues/4739	REPORT
	https://github.com/hashcat/hashcat/pull/4750	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "hashcat",
            "binary_version": "4.0.1-1"
          },
          {
            "binary_name": "hashcat-data",
            "binary_version": "4.0.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "hashcat",
        "purl": "pkg:deb/ubuntu/hashcat@4.0.1-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.60-1",
        "4.0.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "hashcat",
            "binary_version": "5.1.0+ds1-2"
          },
          {
            "binary_name": "hashcat-data",
            "binary_version": "5.1.0+ds1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "hashcat",
        "purl": "pkg:deb/ubuntu/hashcat@5.1.0+ds1-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.1.0+ds1-1",
        "5.1.0+ds1-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "hashcat",
            "binary_version": "6.2.5+ds1-2"
          },
          {
            "binary_name": "hashcat-data",
            "binary_version": "6.2.5+ds1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "hashcat",
        "purl": "pkg:deb/ubuntu/hashcat@6.2.5+ds1-2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.1.1+ds1-1",
        "6.2.5+ds1-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "hashcat",
            "binary_version": "6.2.6+ds1-1build2"
          },
          {
            "binary_name": "hashcat-data",
            "binary_version": "6.2.6+ds1-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "hashcat",
        "purl": "pkg:deb/ubuntu/hashcat@6.2.6+ds1-1build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.2.6+ds1-1",
        "6.2.6+ds1-1build1",
        "6.2.6+ds1-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "hashcat",
            "binary_version": "7.1.2+ds1-3"
          },
          {
            "binary_name": "hashcat-data",
            "binary_version": "7.1.2+ds1-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "hashcat",
        "purl": "pkg:deb/ubuntu/hashcat@7.1.2+ds1-3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.2.6+ds2-1",
        "7.1.2+ds1-3"
      ]
    }
  ],
  "aliases": [],
  "details": "hashcat\u0027s fgetl() function in src/filehandling.c writes a null terminator one byte past the caller\u0027s buffer when an input line is exactly the buffer length. Attackers can trigger this out-of-bounds heap write by providing a hash file, potfile, or wordlist containing a line of exactly HCBUFSIZ_LARGE bytes.",
  "id": "UBUNTU-CVE-2026-68767",
  "modified": "2026-09-02T16:23:49Z",
  "published": "2026-08-22T15:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-68767"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68767"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/hashcat/hashcat/issues/4739"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/hashcat/hashcat/pull/4750"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-68767"
  ]
}

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-2026-68767 (GCVE-0-2026-68767)

FKIE_CVE-2026-68767

GHSA-VGV2-WHP7-2895

ubuntu-cve-2026-68767

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour