# CVE-2026-79725: IBM Langflow OSS path traversal and improper access control

Source: https://junglewise.ai/threats/cve-2026-79725-ibm-langflow-oss-path-traversal-and-improper-access-control  
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-2026-79725 · Severity: medium · CVSS 6.5 · Published 2026-09-10

IBM Langflow OSS is an open-source workflow automation platform that manages files uploaded by users through local and cloud storage. A flaw in access control allows authenticated users to read arbitrary files on the system and access files belonging to other users, potentially exposing sensitive data including application secrets used to encrypt stored credentials.

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-2026-79725 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-79725 being exploited in the wild.

**How severe is CVE-2026-79725?** Medium severity, with a CVSS score of 6.5, 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-2026-79725?** A patch was published on 2026-09-08: Version 1.11.6 available Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-79725 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-79725?** 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 is a path traversal and improper access control flaw (CWE-22, CWE-284, CWE-639) affecting Langflow's file handling in flow execution. The tweaks API accepts attacker-controlled file paths without invoking containment guards, allowing traversal sequences to escape the configured data directory. Additionally, when S3 storage is configured with the LANGFLOW_RESTRICT_LOCAL_FILE_ACCESS flag, a code path detecting pre-existing local files bypasses the confinement check entirely. An authenticated attacker can supply another user's storage namespace through the /api/v1/run/advanced/{flow_id} endpoint to read files belonging to other users in multi-user deployments. The attack requires authentication but no user interaction; it affects confidentiality with potential exposure of application secrets. IBM recommends upgrading to version 1.11.6 or later.

## Affected products

- IBM Langflow OSS 1.0.0 through 1.11.5

## Timeline

- 2026-09-10: disclosed
- 2026-09-08: patched: Version 1.11.6 available

## References

- [https://www.ibm.com/support/pages/node/7286657](https://www.ibm.com/support/pages/node/7286657)

## 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)