CVE-2026-72769
Full vulnerability record from the local CVENow database.
Description
n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process (a sandbox escape), leading to a denial of service. Both self-hosted and cloud instances running the VM expression engine are affected.
Severity
MEDIUM
CVSS score
6.1
(v4.0)
Vulnerability status
Analyzed
Source identifier
Published
2026-08-11 13:19:07.220000
Last modified
2026-10-29 20:17:34.837000
View original CVE JSON
{
"id": "CVE-2026-72769",
"sourceIdentifier": "[email protected]",
"published": "2026-08-11T13:19:07.220",
"lastModified": "2026-10-29T20:17:34.837",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process (a sandbox escape), leading to a denial of service. Both self-hosted and cloud instances running the VM expression engine are affected."
},
{
"lang": "es",
"value": "n8n antes de 1.123.67, 2.31.5 y 2.32.1 contiene una vulnerabilidad de contaminación de prototipos en el motor de expresiones de la VM. Un usuario autenticado capaz de crear o editar una expresión de flujo de trabajo puede abusar del acceso a elementos de array del motor para obtener una referencia a una función integrada del host y contaminar su prototipo en el proceso principal de n8n (un escape de sandbox), lo que lleva a una denegación de servicio. Tanto las instancias autoalojadas como las de la nube que ejecutan el motor de expresiones de la VM se ven afectadas."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "n8n-io",
"product": "n8n",
"defaultStatus": "unaffected",
"packageURL": "pkg:npm/n8n",
"versions": [
{
"version": "0",
"lessThan": "1.123.67",
"versionType": "semver",
"status": "affected"
},
{
"version": "1.123.67",
"versionType": "semver",
"status": "unaffected"
}
]
},
{
"vendor": "n8n-io",
"product": "n8n",
"defaultStatus": "unaffected",
"packageURL": "pkg:npm/n8n",
"versions": [
{
"version": "2.32.0",
"lessThan": "2.32.1",
"versionType": "semver",
"status": "affected"
},
{
"version": "2.32.1",
"versionType": "semver",
"status": "unaffected"
}
]
},
{
"vendor": "n8n-io",
"product": "n8n",
"defaultStatus": "unaffected",
"packageURL": "pkg:npm/n8n",
"versions": [
{
"version": "2.0.0-rc.0",
"lessThan": "2.31.5",
"versionType": "semver",
"status": "affected"
},
{
"version": "2.31.5",
"versionType": "semver",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV40": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "4.0",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/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",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"vulnAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"confidentialityRequirement": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"availabilityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED"
}
}
],
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 2.8,
"impactScore": 5.2
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-08-11T14:02:42.534015Z",
"id": "CVE-2026-72769",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-1321"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*",
"versionEndExcluding": "1.123.67",
"matchCriteriaId": "4CBABC9C-8053-4556-99DF-B6A7BB96DFC0"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*",
"versionStartIncluding": "2.0.0",
"versionEndExcluding": "2.31.5",
"matchCriteriaId": "81F5627C-88DD-42DB-877F-2376B96FF05F"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:a:n8n:n8n:2.32.0:*:*:*:*:node.js:*:*",
"matchCriteriaId": "4AC4E002-974B-4748-A5CB-F8A40E4F3B24"
}
]
}
]
}
],
"references": [
{
"url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-hx4h-vr3m-45vh",
"source": "[email protected]",
"tags": [
"Mitigation",
"Vendor Advisory"
]
},
{
"url": "https://www.vulncheck.com/advisories/n8n-before-prototype-pollution-via-vm-expression-engine",
"source": "[email protected]",
"tags": [
"Third Party Advisory"
]
}
]
}