Critical
Flowise: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape
Type: advisorySources: OSV
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-46442
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 05:19 UTC · Revision 1
Source evidence
Flowise: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape
core-osv · Original sourcePublished 8 Jun 2026, 15:30 UTC
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2.
osv:CVE-2026-46442
Complete source record
{
"id": "61079703a7091eb9db744972bf5003c83d372a52c82390dae69ba1d31cd2f3f3",
"url": "https://osv.dev/vulnerability/CVE-2026-46442",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Flowise: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape",
"summary": "Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2.",
"evidence": "osv:CVE-2026-46442",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-46442",
"aliases": [
"CVE-2026-46442",
"GHSA-9rvc-vf7m-pgm2"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/flowiseai/flowise",
"type": "GIT",
"events": [
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{
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
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"source": "REFERENCES_TAG",
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{
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"range": [
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46442.json"
}
}
],
"modified": "2026-10-28T02:30:33.514795627Z",
"provider": "osv",
"references": [
"https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46442.json",
"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-9rvc-vf7m-pgm2",
"https://nvd.nist.gov/vuln/detail/CVE-2026-46442"
],
"provider_metadata": {
"cwe_ids": [
"CWE-94"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46442.json"
}
},
"related_cves": [
{
"value": "CVE-2026-46442",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 500479,
"published_at": "2026-06-08T15:30:48.999+00:00"
}