{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "last_affected": "26.07.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              },
              {
                "range": [
                  {
                    "fixed": "bc416b997622e43de65afab3bae9b7d05d72f2b0"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "bc416b997622e43de65afab3bae9b7d05d72f2b0"
            }
          ],
          "repo": "https://github.com/gpac/gpac",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/128xxx/CVE-2026-128239.json"
  },
  "details": "GPAC through 26.07.0 contains a NULL pointer dereference vulnerability in the MPEG-4 Form spatial-constraint handlers in src/compositor/mpeg4_form.c that lets attackers crash the process via unchecked group lookups. Attackers can supply a crafted XMT scene whose Form constraints reference a non-existent group, crashing tools like MP4Box during chapter import for denial of service.",
  "id": "CVE-2026-128239",
  "modified": "2026-11-15T02:31:00.368148975Z",
  "published": "2026-11-13T09:33:47.579Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/11/13/3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/128xxx/CVE-2026-128239.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-128239"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/gpac-through-26.07.0-null-pointer-dereference-via-mpeg-4-form-handlers"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gpac/gpac/issues/4029"
    },
    {
      "type": "FIX",
      "url": "https://github.com/gpac/gpac/commit/bc416b997622e43de65afab3bae9b7d05d72f2b0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gpac/gpac"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/gpac/gpac/blob/v26.07.0/src/compositor/mpeg4_form.c#L620-L621"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/221/221_ab_apply_compositor_mpeg4_form_c_627.xmt"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "GPAC through 26.07.0 NULL Pointer Dereference via MPEG-4 Form Handlers"
}