{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "last_affected": "9.0.2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              },
              {
                "range": [
                  {
                    "fixed": "6e5a6578a3503c44ee0f19593e7ffb19812ef0e1"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "ba5783378c0aa1d9ac95b4454bea94b15c63f75d"
            },
            {
              "fixed": "6e5a6578a3503c44ee0f19593e7ffb19812ef0e1"
            }
          ],
          "repo": "https://github.com/neuronsimulator/nrn",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-121"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123203.json"
  },
  "details": "NEURON (CoreNEURON) through 9.0.2 contains a stack buffer overflow vulnerability that allows attackers to corrupt stack memory by supplying over-long tokens in a crafted model dataset. Attackers can place oversized version or mechanism-name tokens in bbcore_mech.dat, globals.dat, or files.dat loaded by nrniv-core to crash the process.",
  "id": "CVE-2026-123203",
  "modified": "2026-11-05T21:15:51.499896699Z",
  "published": "2026-11-05T18:16:39.093Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123203.json"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/neuronsimulator/nrn"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/neuronsimulator/nrn/blob/ba5783378c0aa1d9ac95b4454bea94b15c63f75d/src/coreneuron/io/mk_mech.cpp#L81-L96"
    },
    {
      "type": "FIX",
      "url": "https://github.com/neuronsimulator/nrn/commit/6e5a6578a3503c44ee0f19593e7ffb19812ef0e1"
    },
    {
      "type": "FIX",
      "url": "https://github.com/neuronsimulator/nrn/pull/3932"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123203"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/neuron-through-9.0.2-stack-based-buffer-overflow-via-coreneuron-dataset-tokens"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "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"
    }
  ],
  "summary": "NEURON through 9.0.2 Stack-based Buffer Overflow via CoreNEURON dataset tokens"
}