Vulnerability details
CVE-2026-119978
FlowiseAI Flowise
Flowise through 3.1.4 Custom Function Sandbox Escape RCE via LocalFileStore
CVSS 4.0
9.0Critical
Official description
Flowise through 3.1.4 contains a sandbox escape vulnerability that allows authenticated users to execute OS commands by abusing allowlisted langchain and mammoth modules when ALLOW_BUILTIN_DEP=true. Attackers can submit JavaScript to /api/v1/node-custom-function that writes a file into the mammoth package via LocalFileStore and requires it, escaping vm2 as the Flowise process user.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.0Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
| 8.5High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| FlowiseAI | Flowise | v ≤ 3.1.4 | CVEProject cvelistV5 (CNA) |
References and advisories
6- https://github.com/soovwv/cve/blob/a37354aff1e78c0601772e7716f5318c473e8640/CVE-2026-119978.md technical-description
- https://github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/components/src/utils.ts#L55-L114 technical-description
- https://github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/components/src/utils.ts#L1733 technical-description
- https://github.com/advisories/GHSA-9gvv-qjj3-2p6g related
- https://github.com/FlowiseAI/Flowise product
- https://www.vulncheck.com/advisories/flowise-through-3.1.4-custom-function-sandbox-escape-rce-via-localfilestore third-party-advisory
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Details
- Published
- 2026-10-30
- Last updated
- 2026-11-06
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 20 · Low
Exploit prediction (EPSS)
0.33%
Probability of exploitation in 30 days
27.3%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-749Exposed Dangerous Method or Function