Vulnerability-Lookup

ubuntu-cve-2026-72712

Vulnerability from osv_ubuntu

Published

2026-08-13 00:00

Modified

2026-08-13 00:00

Summary

Details

Nmap versions up to and including 7.99 contains a denial of service vulnerability that allows remote attackers to crash the application by sending a crafted packet containing a zero-length TCP option. The malformed packet forces the Packet:parse_options() function in nselib/packet.lua to allocate objects in an infinite loop, causing an out-of-memory condition that results in application crash.

Severity

6.5 (Medium)


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

6.9 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-72712	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-72712	REPORT
	https://github.com/nmap/nmap/issues/3368	REPORT
	https://github.com/nmap/nmap	REPORT
	https://github.com/nmap/nmap/commit/7ef4ee030a002…	REPORT
	https://www.vulncheck.com/advisories/nmap-denial-…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nmap",
            "binary_version": "6.40-0.2ubuntu1"
          },
          {
            "binary_name": "zenmap",
            "binary_version": "6.40-0.2ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "nmap",
        "purl": "pkg:deb/ubuntu/nmap@6.40-0.2ubuntu1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.40-0.1ubuntu1",
        "6.40-0.2ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ndiff",
            "binary_version": "7.01-2ubuntu2"
          },
          {
            "binary_name": "nmap",
            "binary_version": "7.01-2ubuntu2"
          },
          {
            "binary_name": "zenmap",
            "binary_version": "7.01-2ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "nmap",
        "purl": "pkg:deb/ubuntu/nmap@7.01-2ubuntu2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.47-7",
        "7.01-2ubuntu1",
        "7.01-2ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ndiff",
            "binary_version": "7.60-1ubuntu5"
          },
          {
            "binary_name": "nmap",
            "binary_version": "7.60-1ubuntu5"
          },
          {
            "binary_name": "zenmap",
            "binary_version": "7.60-1ubuntu5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "nmap",
        "purl": "pkg:deb/ubuntu/nmap@7.60-1ubuntu5?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.60-1ubuntu1",
        "7.60-1ubuntu2",
        "7.60-1ubuntu3",
        "7.60-1ubuntu4",
        "7.60-1ubuntu5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ncat",
            "binary_version": "7.80+dfsg1-2ubuntu0.1"
          },
          {
            "binary_name": "ndiff",
            "binary_version": "7.80+dfsg1-2ubuntu0.1"
          },
          {
            "binary_name": "nmap",
            "binary_version": "7.80+dfsg1-2ubuntu0.1"
          },
          {
            "binary_name": "nmap-common",
            "binary_version": "7.80+dfsg1-2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "nmap",
        "purl": "pkg:deb/ubuntu/nmap@7.80+dfsg1-2ubuntu0.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.80+dfsg1-1build1",
        "7.80+dfsg1-1build2",
        "7.80+dfsg1-2",
        "7.80+dfsg1-2build1",
        "7.80+dfsg1-2ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ncat",
            "binary_version": "7.91+dfsg1+really7.80+dfsg1-2ubuntu0.1"
          },
          {
            "binary_name": "ndiff",
            "binary_version": "7.91+dfsg1+really7.80+dfsg1-2ubuntu0.1"
          },
          {
            "binary_name": "nmap",
            "binary_version": "7.91+dfsg1+really7.80+dfsg1-2ubuntu0.1"
          },
          {
            "binary_name": "nmap-common",
            "binary_version": "7.91+dfsg1+really7.80+dfsg1-2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "nmap",
        "purl": "pkg:deb/ubuntu/nmap@7.91+dfsg1+really7.80+dfsg1-2ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.91+dfsg1+really7.80+dfsg1-2",
        "7.91+dfsg1+really7.80+dfsg1-2build1",
        "7.91+dfsg1+really7.80+dfsg1-2ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ncat",
            "binary_version": "7.94+git20230807.3be01efb1+dfsg-3build2"
          },
          {
            "binary_name": "ndiff",
            "binary_version": "7.94+git20230807.3be01efb1+dfsg-3build2"
          },
          {
            "binary_name": "nmap",
            "binary_version": "7.94+git20230807.3be01efb1+dfsg-3build2"
          },
          {
            "binary_name": "nmap-common",
            "binary_version": "7.94+git20230807.3be01efb1+dfsg-3build2"
          },
          {
            "binary_name": "zenmap",
            "binary_version": "7.94+git20230807.3be01efb1+dfsg-3build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "nmap",
        "purl": "pkg:deb/ubuntu/nmap@7.94+git20230807.3be01efb1+dfsg-3build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.94+git20230807.3be01efb1+dfsg-1",
        "7.94+git20230807.3be01efb1+dfsg-2",
        "7.94+git20230807.3be01efb1+dfsg-3",
        "7.94+git20230807.3be01efb1+dfsg-3build1",
        "7.94+git20230807.3be01efb1+dfsg-3build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ncat",
            "binary_version": "7.98+dfsg-1"
          },
          {
            "binary_name": "ndiff",
            "binary_version": "7.98+dfsg-1"
          },
          {
            "binary_name": "nmap",
            "binary_version": "7.98+dfsg-1"
          },
          {
            "binary_name": "nmap-common",
            "binary_version": "7.98+dfsg-1"
          },
          {
            "binary_name": "zenmap",
            "binary_version": "7.98+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "nmap",
        "purl": "pkg:deb/ubuntu/nmap@7.98+dfsg-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.95+dfsg-3",
        "7.98+dfsg-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Nmap versions up to and including 7.99 contains a denial of service vulnerability that allows remote attackers to crash the application by sending a crafted packet containing a zero-length TCP option. The malformed packet forces the Packet:parse_options() function in nselib/packet.lua to allocate objects in an infinite loop, causing an out-of-memory condition that results in application crash.",
  "id": "UBUNTU-CVE-2026-72712",
  "modified": "2026-08-13T00:00:00Z",
  "published": "2026-08-13T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-72712"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72712"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nmap/nmap/issues/3368"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nmap/nmap"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nmap/nmap/commit/7ef4ee030a0023fe22616387a000032e1a678b6a"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/nmap-denial-of-service-via-zero-length-tcp-option-packet"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-72712"
  ]
}

CVE-2026-72712 (GCVE-0-2026-72712)

Vulnerability from cvelistv5 – Published: 2026-08-11 17:35 – Updated: 2026-08-13 14:12

Title

Nmap 7.99 Denial of Service via Zero-Length TCP Option Packet

Summary

Severity

6.9 (Medium)


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

6.5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 14:12 UTC

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

VulnCheck

References

4 references

URL	Tags
https://github.com/nmap/nmap	product
https://github.com/nmap/nmap/issues/3368	issue-tracking
https://github.com/nmap/nmap/commit/7ef4ee030a002…	patch
https://www.vulncheck.com/advisories/nmap-denial-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Nmap Project	Nmap	Affected: 0 , ≤ 7.99 (custom)

Date Public

2026-08-11 00:00

Credits

Maxim Suhanov

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-72712",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-13T14:12:19.370583Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-13T14:12:50.943Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/nmap/nmap/issues/3368"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "Nmap",
          "vendor": "Nmap Project",
          "versions": [
            {
              "lessThanOrEqual": "7.99",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Maxim Suhanov"
        }
      ],
      "datePublic": "2026-08-11T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Nmap versions up to and including 7.99 contains a denial of service vulnerability that allows remote attackers to crash the application by sending a crafted packet containing a zero-length TCP option. The malformed packet forces the Packet:parse_options() function in nselib/packet.lua to allocate objects in an infinite loop, causing an out-of-memory condition that results in application crash."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-835",
              "description": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-11T17:35:06.192Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "Product Repository",
          "tags": [
            "product"
          ],
          "url": "https://github.com/nmap/nmap"
        },
        {
          "name": "GitHub Issue",
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/nmap/nmap/issues/3368"
        },
        {
          "name": "Patch Commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/nmap/nmap/commit/7ef4ee030a0023fe22616387a000032e1a678b6a"
        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/nmap-denial-of-service-via-zero-length-tcp-option-packet"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Nmap 7.99 Denial of Service via Zero-Length TCP Option Packet",
      "x_generator": {
        "engine": "vulncheck"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-72712",
    "datePublished": "2026-08-11T17:35:06.192Z",
    "dateReserved": "2026-08-10T13:02:52.001Z",
    "dateUpdated": "2026-08-13T14:12:50.943Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

ubuntu-cve-2026-72712

Vulnerability from osv_ubuntu

CVE-2026-72712 (GCVE-0-2026-72712)

Tags

Sightings

Nomenclature