Vulnerability DatabaseCVE-2026-123203
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CVE-2026-123203
Published:November 05, 2026
Updated:November 09, 2026
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.
Affected Packages
neuron-nightly (PYTHON):
Affected version(s) >=9.0rc1 <9.1.0.dev36
Fix Suggestion:
Update to version 9.1.0.dev36
Related Resources (7)
https://github.com/neuronsimulator/nrn
https://nvd.nist.gov/vuln/detail/CVE-2026-123203
https://www.vulncheck.com/advisories/neuron-through-9.0.2-stack-based-buffer-overflow-via-coreneuron-dataset-tokens
https://github.com/neuronsimulator/nrn/commit/6e5a6578a3503c44ee0f19593e7ffb19812ef0e1
https://github.com/neuronsimulator/nrn/blob/ba5783378c0aa1d9ac95b4454bea94b15c63f75d/src/coreneuron/io/mk_mech.cpp#L81-L96
https://github.com/neuronsimulator/nrn/pull/3932
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123203.json
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CVSS v4
Base Score:
6.9
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.1
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
Weakness Type (CWE)
Stack-based Buffer Overflow
CWE-121
EPSS
Base Score:
0.14