CVE-2026-119978: Flowise Sandbox Escape Leads to OS Command Execution

# CVE-2026-119978: Flowise Sandbox Escape Leads to OS Command Execution

https://gcdradar.vercel.app/incidents/cve-2026-119978-flowise-sandbox-escape-leads-to-os-command-e · AIR-2026-1670 · closed 2026-10-30

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability): CVSS 9 critical vulnerability with no confirmed exploitation in the wild.
- Fix status: Fix status unknown
- First reported: 2026-10-30
- AI role: Attack on AI
- Products: Flowise
- CVE ids: CVE-2026-119978
- CVSS: 9

## Summary

Flowise through version 3.1.4 contains a sandbox escape vulnerability allowing authenticated users to execute operating system commands by abusing allowlisted langchain and mammoth modules. Attackers can submit malicious JavaScript to the custom function API endpoint.

## What to do

Review Flowise configuration and restrict access or update when patches become available.

## Affected and fixed versions

- Affected: Flowise <= 3.1.4

## Latest updates

- 2026-10-30: CVE-2026-119978: Flowise through 3.1.4 contains a sandbox escape vulnerability that allows authenticated users to execute OS commands by abusing… (https://nvd.nist.gov/vuln/detail/CVE-2026-119978)

## Sources

- 2026-10-30 NVD: CVE-2026-119978: Flowise through 3.1.4 contains a sandbox escape vulnerability that allows authenticated users to execute OS commands by abusing… https://nvd.nist.gov/vuln/detail/CVE-2026-119978

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.