Langflow OSS: Code injection allows remote code execution
Summary
IBM Langflow OSS versions 1.0.0 through 1.12.4 contain a code injection flaw (CWE-94) that lets a remote attacker with a valid low-privilege account execute arbitrary code on the server. No user interaction is required. Code runs inside the Langflow process, which can expose workflow data, credentials and connected model, database or tool services. Sources list CVSS 8.8 or 9.9 depending on the scope assessment.
Affected
- IBM Langflow OSS 1.0.0 through 1.12.4
Fixed in
- Upgrade to Langflow OSS 1.12.5 (IBM bulletin 7293016)
Workaround
- No CVE-specific workaround documented.
- For MCP stdio deployments, IBM recommends setting LANGFLOW_MCP_SERVER_INTERPRETER_HARDENING=true and LANGFLOW_CUSTOM_COMPONENT_ADMIN_ONLY=true, then restarting Langflow. This does not replace the upgrade.
- Keep public custom-component execution disabled (default setting).
Exploitation
- Not known to be exploited; not listed in CISA KEV at the time of research.
- CISA SSVC: Exploitation none, Automatable no, Technical impact total.
- Public proof-of-concept availability is unknown.
- EPSS: 0.82 % (percentile 57).
Our recommendation
- Inventory all Langflow OSS instances, including test and development systems.
- Upgrade to 1.12.5 or later and test your flows.
- If MCP stdio is used, apply the IBM configuration controls.
- Restrict access to Langflow (VPN or allow-list) and review accounts and logs.
- Rotate API keys and credentials that the Langflow host can reach.
Public exploits
Links to third-party sites, not checked by us – exploit code can contain malware. Only use it in isolated test environments.
- Proof of concept on GitHub (1 repositories)
rmhowe425/POC-CVE-2026-107329
Research sources
- IBM Security Bulletin 7293016 www.ibm.com
- Strix: CVE-2026-107329 www.strix.ai
- ThreatIntel: CVE-2026-107329 cve.threatint.com
- RedPacket Security: CVE-2026-107329 www.redpacketsecurity.com
- OffSeq Radar: CVE-2026-107329 radar.offseq.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 09:15.
Original description (NVD)
IBM Langflow OSS 1.0.0 through 1.12.4 could allow a remote authenticated attacker to execute arbitrary code due to improper control of code generation.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.