# CVE-2026-78569: IBM Langflow OSS incomplete denylist code execution

Source: https://junglewise.ai/threats/cve-2026-78569-ibm-langflow-oss-incomplete-denylist-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-78569 · Severity: high · CVSS 8.8 · Published 2026-09-10

IBM Langflow OSS is a visual development platform for building AI applications. An authenticated attacker can bypass the security scanner's code execution restrictions due to an incomplete denylist, allowing them to execute arbitrary code on the server with the same privileges as the application process.

Technologies: [IBM Langflow OSS](https://junglewise.ai/threats/technologies/langflow-oss), [Langflow](https://junglewise.ai/threats/technologies/langflow). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm), [Langflow](https://junglewise.ai/threats/vendors/langflow).

## Quick answers

**Is CVE-2026-78569 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78569 being exploited in the wild.

**How severe is CVE-2026-78569?** High severity, with a CVSS score of 8.8, published 10 September 2026.

**Which products and versions are affected?** IBM Langflow OSS 1.0.0 through 1.11.5.

**Is there a fix for CVE-2026-78569?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-78569 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-78569?** Check whether you run IBM Langflow OSS or Langflow at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in Langflow's agentic assistant code scanner, which uses an incomplete denylist to restrict dangerous operations. The scanner omits process-spawning primitives from its blocklist and contains a logic error where annotated class-body assignments bypass the safety check entirely. An authenticated attacker can craft a flow that uses these overlooked primitives to execute arbitrary code. The vulnerability requires prior authentication but no additional user interaction, and successful exploitation grants code execution at the application's privilege level.

## Affected products

- IBM Langflow OSS 1.0.0 through 1.11.5

## Timeline

- 2026-09-10: disclosed

## References

- [https://www.ibm.com/support/pages/node/7286666](https://www.ibm.com/support/pages/node/7286666)

## Related threats

- [IBM Langflow OSS path traversal arbitrary file read and write](https://junglewise.ai/threats/cve-2026-97677-ibm-langflow-oss-1-0-0-through-1-12-2-an-authenticated-flow)
- [IBM Langflow OSS authentication bypass](https://junglewise.ai/threats/cve-2026-93680-ibm-langflow-oss-1-0-0-through-1-12-8-could-allow-a-remote)
- [IBM Langflow OSS denial of service via resource exhaustion](https://junglewise.ai/threats/cve-2026-90991-ibm-langflow-oss-1-0-0-through-1-12-4-could-allow-a-remote)
- [IBM Langflow OSS path traversal arbitrary file overwrite](https://junglewise.ai/threats/cve-2026-77819-ibm-langflow-oss-1-0-0-through-1-12-3-could-allow-a-remote)
- [IBM Langflow OSS improper sanitization of secrets in exports](https://junglewise.ai/threats/cve-2026-77817-ibm-langflow-oss-1-0-0-through-1-12-4-could-allow-a-remote)