---
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'
---

## Overview

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

- `NEURON <= 9.0.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.