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.
Executive TL;DR
- What:
CVE-2025-34267
— an authenticated command execution + sandbox escape affecting Flowise v3.0.1 < 3.0.8 and “all versions after withALLOW_BUILTIN_DEP
enabled
ALLOW_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)
- Inventory every Flowise instance (dev, staging, prod; containers & pods). Document version and
ALLOW_BUILTIN_DEP
state. - Upgrade to v3.0.8 or later across all environments. Rebuild images and re-deploy.
- Harden config:
- Set
ALLOW_BUILTIN_DEP=false
unless a tightly-scoped use case demands it. - Disable/remediate risky tools (
WriteFileTool
, broad file uploaders, unvettedfetch-links
) or gate them behind role-based access.
- Set
- Rotate secrets (LLM keys, DB creds, S3 tokens, OAuth). Assume compromise if telemetry is incomplete.
- Network controls: Egress-restrict Flowise to only approved APIs; block outbound to internal RFC1918 ranges to mitigate SSRF.
- 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
- Confirm app version ≥ 3.0.8 in container image and runtime.
- Ensure
ALLOW_BUILTIN_DEP
is false (unless you’ve explicitly risk-accepted and fenced it with AppArmor/SELinux). - 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 dirsnoexec
. - 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
.
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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.
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