PatchTheCVECVE-2026-73601: Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOM
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This month
HIGH 8.8UPGRADE
CVE-2026-73601 is a high-severity flaw (CVSS 8.8) affecting flowise. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOM_MCP_PROTOCOL is set to stdio, allowing authenticated users to execute arbitrary commands by manipulating environment variables and command arguments. Attackers can abuse PYTHONWARNINGS and BROWSER environment variables with python3, or leverage the root working directory with node to bypass validation and execute system commands.
Why this priority
- High severity
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 35%) |
| CISA exploited list | No |
| Weakness | CWE-95 |
| Published | 2026-08-13 |
| Last modified | 2026-10-23 |
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
flowiseai flowise UPGRADE
Affected: < 3.1.3
Fixed in: 3.1.3
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flowise || rpm -q flowise || flowise --version
2. UPGRADE to 3.1.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade flowise
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade flowise
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Exact fixes by distribution
Fedora 46 · wasmedge · FIXED · 0.18.1-1.fc46 · FEDORA-2026-4c27216e39 · source
sudo dnf upgrade --advisory=FEDORA-2026-4c27216e39
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Related CVEs
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- CVE-2026-69254 HIGH 8.8 UPGRADE Flowise is a drag & drop user interface to build a customized large language model flow
- CVE-2026-69250 HIGH 7.5 UPGRADE Flowise is a drag & drop user interface to build a customized large language model flow
- CVE-2026-69252 HIGH 8.8 UPGRADE Flowise is a drag & drop user interface to build a customized large language model flow
- CVE-2026-69264 CRITICAL 9.8 UPGRADE Prior to 3.1.3, Flowise CSVAgent interpolates an attacker-controlled segment of the csvFile data URI directly