Vulnerability-Lookup

PYSEC-2026-3544

Vulnerability from pysec - Published: 2026-07-21 21:16 - Updated: 2026-07-31 09:27

Details

Capstone is a disassembly framework. Versions prior to 6.0.0-Alpha8 and 5.0.8 have a NULL pointer dereference in modRMRequired() and decode() when disassembling 3DNow! opcodes (0F 0F) in builds compiled with -DCAPSTONE_X86_REDUCE, allowing a remote attacker to crash any application using the reduced X86 Capstone library by supplying a crafted input containing the 4-byte sequence 0F 0F <modrm> <imm8>. Versions 6.0.0-Alpha8 and 5.0.8 patch the issue.

Severity

5.9 (Medium)


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

Impacted products

Name	purl
capstone	pkg:pypi/capstone

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "capstone",
        "purl": "pkg:pypi/capstone"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.0.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0",
        "2.1",
        "3.0",
        "3.0.1",
        "3.0.2",
        "3.0.3",
        "3.0.4",
        "3.0.5",
        "3.0.5.post1",
        "3.0.5rc2",
        "4.0.0",
        "4.0.1",
        "4.0.2",
        "5.0.0",
        "5.0.0.post1",
        "5.0.0rc2",
        "5.0.0rc4",
        "5.0.1",
        "5.0.2",
        "5.0.3",
        "5.0.4",
        "5.0.5",
        "5.0.6",
        "5.0.7"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-47143",
    "GHSA-289w-cm54-fgrm"
  ],
  "details": "Capstone is a disassembly framework. Versions prior to 6.0.0-Alpha8 and 5.0.8 have a NULL pointer dereference in `modRMRequired()` and `decode()` when disassembling 3DNow! opcodes (`0F 0F`) in builds compiled with `-DCAPSTONE_X86_REDUCE`, allowing a remote attacker to crash any application using the reduced X86 Capstone library by supplying a crafted input containing the 4-byte sequence `0F 0F \u003cmodrm\u003e \u003cimm8\u003e`. Versions 6.0.0-Alpha8 and 5.0.8 patch the issue.",
  "id": "PYSEC-2026-3544",
  "modified": "2026-07-31T09:27:55.417579Z",
  "published": "2026-07-21T21:16:50.270Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab2898843718f92d1f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225f1c7"
    },
    {
      "type": "FIX",
      "url": "https://github.com/capstone-engine/capstone/pull/2924"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-47143 (GCVE-0-2026-47143)

Vulnerability from cvelistv5 – Published: 2026-07-21 20:10 – Updated: 2026-07-22 13:42

Title

Capstone has a NULL Pointer Dereference with 3DNow! opcodes

Summary

Capstone is a disassembly framework. Versions prior to 6.0.0-Alpha8 and 5.0.8 have a NULL pointer dereference in `modRMRequired()` and `decode()` when disassembling 3DNow! opcodes (`0F 0F`) in builds compiled with `-DCAPSTONE_X86_REDUCE`, allowing a remote attacker to crash any application using the reduced X86 Capstone library by supplying a crafted input containing the 4-byte sequence `0F 0F <modrm> <imm8>`. Versions 6.0.0-Alpha8 and 5.0.8 patch the issue.

Severity

5.1 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/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 2026-07-22 13:42 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/capstone-engine/capstone/secur…	x_refsource_CONFIRM
https://github.com/capstone-engine/capstone/pull/2924	x_refsource_MISC
https://github.com/capstone-engine/capstone/commi…	x_refsource_MISC
https://github.com/capstone-engine/capstone/commi…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
capstone-engine	capstone	Affected: < 5.0.8 Affected: < 6.0.0-Alpha8

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-47143",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-22T13:42:44.951327Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-22T13:42:55.326Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "capstone",
          "vendor": "capstone-engine",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.0.8"
            },
            {
              "status": "affected",
              "version": "\u003c 6.0.0-Alpha8"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Capstone is a disassembly framework. Versions prior to 6.0.0-Alpha8 and 5.0.8 have a NULL pointer dereference in `modRMRequired()` and `decode()` when disassembling 3DNow! opcodes (`0F 0F`) in builds compiled with `-DCAPSTONE_X86_REDUCE`, allowing a remote attacker to crash any application using the reduced X86 Capstone library by supplying a crafted input containing the 4-byte sequence `0F 0F \u003cmodrm\u003e \u003cimm8\u003e`. Versions 6.0.0-Alpha8 and 5.0.8 patch the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-476",
              "description": "CWE-476: NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-21T20:10:44.476Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-289w-cm54-fgrm"
        },
        {
          "name": "https://github.com/capstone-engine/capstone/pull/2924",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/capstone-engine/capstone/pull/2924"
        },
        {
          "name": "https://github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab2898843718f92d1f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/capstone-engine/capstone/commit/a0201371719b5aaa91d318ab2898843718f92d1f"
        },
        {
          "name": "https://github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225f1c7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/capstone-engine/capstone/commit/fab595205fee206f5c21be6ed8ad2eaf9225f1c7"
        }
      ],
      "source": {
        "advisory": "GHSA-289w-cm54-fgrm",
        "discovery": "UNKNOWN"
      },
      "title": "Capstone has a NULL Pointer Dereference with 3DNow! opcodes"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-47143",
    "datePublished": "2026-07-21T20:10:44.476Z",
    "dateReserved": "2026-05-18T19:50:18.696Z",
    "dateUpdated": "2026-07-22T13:42:55.326Z",
    "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.

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