{"id":"CVE-2026-123203","title":"NEURON through 9.0.2 Stack-based Buffer Overflow via CoreNEURON dataset tokens","summary":"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-n…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","cvssSource":"cna","cwe":["CWE-121"],"vendor":"neuronsimulator","product":"NEURON","affected":["NEURON <= 9.0.2"],"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T18:16:39.093Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123203","references":[{"url":"https://github.com/neuronsimulator/nrn/pull/3932"},{"url":"https://github.com/neuronsimulator/nrn/commit/6e5a6578a3503c44ee0f19593e7ffb19812ef0e1"},{"url":"https://github.com/neuronsimulator/nrn/blob/ba5783378c0aa1d9ac95b4454bea94b15c63f75d/src/coreneuron/io/mk_mech.cpp#L81-L96"},{"url":"https://www.vulncheck.com/advisories/neuron-through-9.0.2-stack-based-buffer-overflow-via-coreneuron-dataset-tokens","label":"VulnCheck Advisory: NEURON through 9.0.2 Stack-based Buffer Overflow via CoreNEURON dataset tokens"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T22:38:31.458Z","slug":"CVE-2026-123203","body":"## Overview\n\nNEURON (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.\n\n## Affected\n\n- `NEURON <= 9.0.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}