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Critical Command Injection Flaw (CVE-2025-34267) in Your Flowise LLM App.

CYBERDUDEBIVASH

EMERGENCY PATCH NOW: Critical Command Injection Flaw (CVE-2025-34267) in Your Flowise LLM App

Authenticated RCE + Node VM sandbox escape via Puppeteer/Playwright integration. Exploit enables full server takeover, data exfiltration, and supply-chain abuse in AI agent pipelines.

By CyberDudeBivash ThreatWire • October 15, 2025 • LLM Security, DevSecOps, AI Agents, Cloud Security

Executive TL;DR

. Attackers can point Puppeteer/Playwright to attacker-controlled binaries/flags to run arbitrary OS commands. Impact: Full server compromise (RCE), credential theft, lateral movement into CI/CD, poisoning of agent workflows, data exfiltration. CVSS reported high/critical (8.4+). Fix now: Upgrade to Flowise 3.0.8+, disableALLOW_BUILTIN_DEP unless required, and lock down tool permissions. Related Flowise issues (arbitrary file write, SSRF, upload) were also patched around 3.0.8—patch holistically.

Who’s Affected

  • Teams self-hosting Flowise (Kubernetes, Docker, bare-metal) for AI agents, RAG, chatbots, autonomous tools.
  • Environments where ALLOW_BUILTIN_DEP is enabled (often set to use headless browsers for scraping/automation).
  • US/EU/UK/AU/IN enterprises in Financial Services, Healthcare (HIPAA), Retail (PCI DSS), Manufacturing/OT, SaaS—especially those subject to SOX, GDPR, SOC 2, ISO 27001, and Cyber insurance requirements.

Business Impact

  • Revenue & SLA risk: RCE can disrupt AI-powered customer flows, personalization, or support bots—impacting conversion and uptime.
  • Data loss: Exfiltration of embeddings, prompts, API keys, and customer PII → GDPR/CCPA exposure & fines.
  • Supply-chain blast radius: Compromised agents can push poisoned data into search indices, vector DBs, CI/CD.
  • Insurance & compliance: Unpatched critical CVEs can void cyber insurance claims and SOC 2 attestation.

Root Cause (Technical)

Flowise integrates Puppeteer/Playwright inside a Node VM to power browser automation. In vulnerable builds, authenticated users can craft tools/chains that override the browser binary path and arguments, letting them execute attacker-controlled binaries/flags and escape the sandbox to the host OS. 

Security researchers and advisories also highlight adjacent risks: arbitrary file write (WriteFileTool), weak upload validation, and SSRF in helper APIs—common post-exploitation pivots. Patch them alongside CVE-2025-34267. 

Emergency Patch Plan (Do This Now)

  1. Inventory every Flowise instance (dev, staging, prod; containers & pods). Document version and ALLOW_BUILTIN_DEP state.
  2. Upgrade to v3.0.8 or later across all environments. Rebuild images and re-deploy. 
  3. Harden config:
    • Set ALLOW_BUILTIN_DEP=false unless a tightly-scoped use case demands it. 
    • Disable/remediate risky tools (WriteFileTool, broad file uploaders, unvetted fetch-links) or gate them behind role-based access. 
  4. Rotate secrets (LLM keys, DB creds, S3 tokens, OAuth). Assume compromise if telemetry is incomplete.
  5. Network controls: Egress-restrict Flowise to only approved APIs; block outbound to internal RFC1918 ranges to mitigate SSRF.
  6. Monitor for IOC patterns below and quarantine suspicious agents/flows.

Detection & IOCs

  • Unusual node/bash/sh child processes spawned from Flowise container/pod.
  • Puppeteer/Playwright invoked with unexpected --executablePath, non-standard flags, or binary paths outside blessed locations. 
  • Writes to system dirs from Flowise UID (e.g., /usr/bin, /etc/cron.d), or sudden modifier spikes in /app/.flowise.
  • Outbound callbacks (DNS/HTTP) to unfamiliar hosts shortly after tool execution.

Tip: Add rules in EDR/XDR/SIEM (US/EU/UK/AU/IN tenants) to alert on playwright/puppeteer launching external binaries and on file writes beyond app directories.

How to Validate Your Fix 

  1. Confirm app version ≥ 3.0.8 in container image and runtime. 
  2. Ensure ALLOW_BUILTIN_DEP is false (unless you’ve explicitly risk-accepted and fenced it with AppArmor/SELinux).
  3. Run regression tests for agent chains using headless browsers; verify they still function with restricted flags and approved binaries only.

Defense-in-Depth Hardening 

  • Zero Trust network policy around Flowise (K8s NetworkPolicy, cloud firewalls). Segment from data lakes, PCI/PHI systems.
  • WAF/CDN in front of public Flowise endpoints; enforce OAuth2, SSO, and device posture for admin UI.
  • Least-privilege pods with read-only FS, no root, seccomp, and drop CAP_SYS_ADMIN. Mount tmp dirs noexec.
  • Content Security: sign agent artifacts, pin package versions, and mirror npm via Artifact Registry.
  • Monitoring: map detections to MITRE ATT&CK (T1059, T1210, T1190, T1021) in your SIEM/XDR.

SOC Runbook: 30-60-90 Minutes

0–30 Minutes

  • Block public access; enforce IP allow-lists.
  • Snapshot containers/volumes for forensics; preserve logs.

30–60 Minutes

  • Patch to 3.0.8+, toggle ALLOW_BUILTIN_DEP=false, redeploy.
  • Rotate tokens (LLM/DB/object storage).

60–90 Minutes

  • Hunt for persistence (cron, systemd, webshells), clean and re-image if needed.
  • File initial incident note for GDPR/PCI/HIPAA if applicable.

FAQ

Is this unauthenticated? No—authenticated exploitation via tools that leverage Puppeteer/Playwright. Don’t treat that as comfort: API keys are easy to phish or steal post-SSRF. 

What version fixes it? 3.0.8+, plus disabling risky flags/deps. Also address related advisories (file write, upload, SSRF). 

We’re on managed Flowise cloud—impacted? Check the provider’s status/advisories and enforce SSO + MFA; assume the same API surfaces unless stated otherwise. 

Sources

  • NVD entry for CVE-2025-34267. 
  • VulnCheck advisory: Authenticated Command Execution & Sandbox Bypass in Flowise. 
  • GitHub Advisory GHSA-r4hh-pcgx-j5r2. 
  • NVD: Arbitrary file write/read tools fixed in 3.0.8. 
  • NVD: 3.0.7 Upload vulnerability (web shell risk). 
  • Miggo: SSRF in /api/v1/fetch-links. 

Read Next

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Recommended Enterprise-Grade Tools

  • Cloud WAF/CDN for API shielding & bot defense (good for AI agent gateways).
  • Managed EDR/XDR with container telemetry (detect Playwright/Puppeteer abuse).
  • Secrets Manager & KMS rotation workflows after incidents.
  • Compliance Automation for SOC 2 / ISO 27001 / HIPAA evidence collection.

Note: We only recommend tools we’d deploy ourselves. Some links may become affiliate links later; this supports independent reporting without paywalls.

About CyberDudeBivash ThreatWire

We publish action-first security briefings for CISOs, cloud architects, DevOps, and SOC leaders across the US/EU/UK/AU/IN. Our coverage focuses on zero-day exploitation, LLM/AI security, OT/ICS risk, PCI/HIPAA/SOC 2 controls, and high-CPC topics that actually drive risk reduction and ROI.

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