{"id":"CVE-2026-123203","summary":"NEURON through 9.0.2 Stack-based Buffer Overflow via CoreNEURON dataset tokens","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.","modified":"2026-11-05T21:32:46.607590649Z","published":"2026-11-05T18:16:39.093Z","database_specific":{"cwe_ids":["CWE-121"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123203.json","cna_assigner":"VulnCheck"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/neuronsimulator/nrn","events":[{"introduced":"0"},{"last_affected":"ba5783378c0aa1d9ac95b4454bea94b15c63f75d"},{"fixed":"6e5a6578a3503c44ee0f19593e7ffb19812ef0e1"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"last_affected":"9.0.2"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"6e5a6578a3503c44ee0f19593e7ffb19812ef0e1"}]}]}}],"versions":["9.1.0.dev0","9.0.2","9.0.1.rc1","9.0.1","9.0.rc1","9.0.0","9.0a","9.0.dev","8.2a","8.2.dev","8.1a","8.0a","8.0.dev","7.8.0","7.7.1","7.7.0","7.6.5","7.6.4","7.6.3","7.6.2","7.6.1","7.6.0","1665alpha"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-123203.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","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"}]}