# CVE-2026-81204: IBM Langflow OSS code injection in graph construction

Source: https://junglewise.ai/threats/cve-2026-81204-ibm-langflow-oss-code-injection-in-graph-construction  
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-2026-81204 · Severity: critical · CVSS 9.8 · Published 2026-09-10

IBM Langflow is an open-source low-code platform for building AI applications and workflows. This vulnerability allows an unauthenticated remote attacker to inject and execute arbitrary code when constructing a workflow graph, potentially leading to full system compromise, data theft, and service disruption. An attacker could gain complete control over the server and access sensitive data including credentials and user information.

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-2026-81204 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-81204 being exploited in the wild.

**How severe is CVE-2026-81204?** Critical severity, with a CVSS score of 9.8, 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-2026-81204?** 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-2026-81204 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-81204?** 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

CVE-2026-81204 is a code injection vulnerability in the graph construction component of IBM Langflow OSS versions 1.0.0 through 1.11.5. The vulnerability exists due to improper control of code generation when processing user-supplied graph data, allowing injection of arbitrary Python code. The attack requires no authentication and can be triggered via network access to the vulnerable endpoint. An attacker can achieve remote code execution with the privileges of the application process, leading to data exfiltration, system compromise, and potential lateral movement. IBM has classified this as critical with a CVSS v3.1 score of 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Patches or updates are available from IBM.

## 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)