{"affected":[{"defaultStatus":"unaffected","ecosystem":"pypi","packageName":"neuron","product":"NEURON","source":"CNA: VulnCheck","vendor":"neuronsimulator","versions":[{"lessThanOrEqual":"9.0.2","status":"affected","version":"0","versionType":"custom"}]}],"cveId":"CVE-2026-123203","cwes":["CWE-121"],"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.","epss":{"date":"2026-11-09","percentile":0.03683,"score":0.00144},"exploits":[],"kev":null,"metrics":[{"score":6.9,"severity":"medium","source":"CNA: VulnCheck","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","version":"4.0"},{"score":6.1,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","version":"3.1"},{"score":6.9,"severity":"medium","source":"NVD: disclosure@vulncheck.com","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","version":"4.0"},{"score":6.1,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","version":"3.1"}],"modifiedAt":1794266234550,"publishedAt":1793902599093,"references":[{"source":"CNA: VulnCheck","tags":["issue-tracking","patch"],"url":"https://github.com/neuronsimulator/nrn/pull/3932"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/neuronsimulator/nrn/commit/6e5a6578a3503c44ee0f19593e7ffb19812ef0e1"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/neuronsimulator/nrn/blob/ba5783378c0aa1d9ac95b4454bea94b15c63f75d/src/coreneuron/io/mk_mech.cpp#L81-L96"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/neuron-through-9.0.2-stack-based-buffer-overflow-via-coreneuron-dataset-tokens"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/neuronsimulator/nrn/blob/ba5783378c0aa1d9ac95b4454bea94b15c63f75d/src/coreneuron/io/mk_mech.cpp#L81-L96"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/neuronsimulator/nrn/commit/6e5a6578a3503c44ee0f19593e7ffb19812ef0e1"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/neuronsimulator/nrn/pull/3932"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/neuron-through-9.0.2-stack-based-buffer-overflow-via-coreneuron-dataset-tokens"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/neuronsimulator/nrn/pull/3932"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/neuronsimulator/nrn/commit/6e5a6578a3503c44ee0f19593e7ffb19812ef0e1"}],"revision":"a6be2467ac3e0f29547d5abb9be50666c526e697a3ce02378d95b112ae80d6a4","sources":[{"modifiedAt":1794263422773,"name":"CNA: VulnCheck","retrievedAt":1794265739567,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123203"},{"modifiedAt":1794266234550,"name":"NVD","retrievedAt":1794269890838,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123203"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794265767039,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-123203"}],"ssvc":{"assessedAt":1794263411647,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"NEURON through 9.0.2 Stack-based Buffer Overflow via CoreNEURON dataset tokens","updatedAt":1794269890838}