{"id":"CVE-2026-123203","aliases":["EUVD-2026-117648","GHSA-qgg2-74c2-x77r"],"status":"published","title":"NEURON through 9.0.2 Stack-based Buffer Overflow via CoreNEURON dataset tokens","description":"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.","severity":{"version":"4.0","score":6.9,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00144,"percentile":0.03725,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121"],"published":"2026-11-05T18:16:39Z","modified":"2026-11-05T21:34:53Z","products":[{"vendor":"emqx","product":"neuron"},{"vendor":"neuronsimulator","product":"neuron"}],"references":[{"url":"https://github.com/neuronsimulator/nrn/pull/3932","tags":["issue-tracking","patch","fix"]},{"url":"https://github.com/neuronsimulator/nrn/commit/6e5a6578a3503c44ee0f19593e7ffb19812ef0e1","tags":["patch","fix"]},{"url":"https://github.com/neuronsimulator/nrn/blob/ba5783378c0aa1d9ac95b4454bea94b15c63f75d/src/coreneuron/io/mk_mech.cpp#L81-L96","tags":["technical-description","article"]},{"url":"https://www.vulncheck.com/advisories/neuron-through-9.0.2-stack-based-buffer-overflow-via-coreneuron-dataset-tokens","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123203","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-qgg2-74c2-x77r"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123203.json","tags":["advisory"]},{"url":"https://github.com/neuronsimulator/nrn","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-123203","title":"NEURON through 9.0.2 Stack-based Buffer Overflow via CoreNEURON dataset tokens","description":"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.","status":"published","published":"2026-11-05T18:16:39.093Z","modified":"2026-11-09T22:30:22.773Z","cvss":[{"version":"4.0","score":6.9,"vector":"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","level":"medium","assessor":"cna"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-09T23:35:21.703923Z"}],"euvd":[{"id":"EUVD-2026-117648","description":"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.","status":"published","published":"2026-11-05T18:16:39Z","modified":"2026-11-09T22:30:22Z","cvss":[{"version":"4.0","score":6.9,"vector":"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","level":"medium"}],"updated_at":"2026-11-09T23:18:32.235826Z"}],"ghsa":[{"id":"GHSA-qgg2-74c2-x77r","title":"NEURON (CoreNEURON) through 9.0.2 contains a stack buffer overflow vulnerability that allows...","description":"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.","status":"published","published":"2026-11-05T21:34:50Z","modified":"2026-11-05T21:34:53Z","cvss":[{"version":"4.0","score":6.9,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","level":"medium"}],"cwes":["CWE-121"],"updated_at":"2026-11-05T21:56:38.142385Z"}],"nvd":[{"id":"CVE-2026-123203","description":"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.","status":"published","published":"2026-11-05T19:17:19.53Z","modified":"2026-11-12T20:57:59.173Z","cvss":[{"version":"4.0","score":6.9,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-121"],"updated_at":"2026-11-10T02:16:32.988634Z"}],"osv":[{"id":"CVE-2026-123203","title":"NEURON through 9.0.2 Stack-based Buffer Overflow via CoreNEURON dataset tokens","description":"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.","status":"published","published":"2026-11-05T18:16:39.093Z","modified":"2026-11-11T07:21:12.738314328Z","cvss":[{"version":"4.0","score":6.9,"vector":"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","level":"medium"}],"cwes":["CWE-121"],"updated_at":"2026-11-07T03:08:01.726202Z"}]}}