CVE-2026-123203

NEURON through 9.0.2 Stack-based Buffer Overflow via CoreNEURON dataset tokens

publishedCWE-121

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.

Technical severity6.9 mediumCVSS 4.0 · CNA: VulnCheck

Published2026-11-05Source updated 2026-11-09

Collected2026-11-103 attributed sources

Fixes and workarounds

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: VulnCheck

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: VulnCheck

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
NEURON neuronsimulator `neuron` pypi	≥ 0; ≤ 9.0.2 (affected, custom) Other versions: unaffected	CNA: VulnCheck

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
4.0 / 6.9 medium	`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`	CNA: VulnCheck
3.1 / 6.1 medium	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H`	CNA: VulnCheck
4.0 / 6.9 medium	`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`	NVD: [email protected]
3.1 / 6.1 medium	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H`	NVD: [email protected]

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://github.com/neuronsimulator/nrn/pull/3932CNA: VulnCheck · issue-tracking, patch
https://github.com/neuronsimulator/nrn/commit/6e5a6578a3503c44ee0f19593e7ffb19812ef0e1CNA: VulnCheck · patch
https://github.com/neuronsimulator/nrn/blob/ba5783378c0aa1d9ac95b4454bea94b15c63f75d/src/coreneuron/io/mk_mech.cpp#L81-L96CNA: VulnCheck · technical-description
https://www.vulncheck.com/advisories/neuron-through-9.0.2-stack-based-buffer-overflow-via-coreneuron-dataset-tokensCNA: VulnCheck · third-party-advisory
https://github.com/neuronsimulator/nrn/blob/ba5783378c0aa1d9ac95b4454bea94b15c63f75d/src/coreneuron/io/mk_mech.cpp#L81-L96[email protected]
https://github.com/neuronsimulator/nrn/commit/6e5a6578a3503c44ee0f19593e7ffb19812ef0e1[email protected]
https://github.com/neuronsimulator/nrn/pull/3932[email protected]
https://www.vulncheck.com/advisories/neuron-through-9.0.2-stack-based-buffer-overflow-via-coreneuron-dataset-tokens[email protected]

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