# CVE-2026-3345: IBM Langflow Desktop path traversal in API v2 file upload

Source: https://junglewise.ai/threats/cve-2026-3345-ibm-langflow-desktop-path-traversal-in-api-v2-file-upload  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-30. Updated: 2026-05-11  
License: CC BY 4.0 with a link back

CVE-2026-3345 · Severity: medium · CVSS 6.5 · Published 2026-04-30

IBM Langflow Desktop, a tool used for building and deploying AI applications, contains a security flaw that allows users to access files they should not be able to see. By sending a specially crafted request, an attacker with basic user access could view sensitive system files or overwrite application data. This could lead to the theft of confidential information or a complete takeover of the application service.

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

## Quick answers

**Is CVE-2026-3345 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-3345 being exploited in the wild.

**How severe is CVE-2026-3345?** Medium severity, with a CVSS score of 6.5, published 30 April 2026.

**Which products and versions are affected?** IBM Langflow Desktop <=1.8.4.

**Is there a fix for CVE-2026-3345?** A patch was published on 2026-04-28: Remediation available in version 1.9.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-3345 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-3345?** Check whether you run IBM Langflow Desktop 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

A path traversal vulnerability exists in IBM Langflow Desktop versions 1.8.4 and earlier within the API v2 file upload functionality. The 'POST /api/v2/files' endpoint fails to properly validate and sanitize user-supplied filenames before they are processed by the LocalStorageService. An authenticated remote attacker can exploit this by using 'dot dot' (/../) sequences in a URL or filename to traverse the directory structure. This allows for the unauthorized viewing of arbitrary files or the overwriting of sensitive application files, such as configuration data or databases, potentially leading to remote code execution. The issue is resolved in version 1.9.0.

## Affected products

- IBM Langflow Desktop <=1.8.4

## Timeline

- 2026-04-28: advisory: Initial publication of IBM security bulletin
- 2026-04-30: disclosed: CVE-2026-3345 published to NVD
- 2026-04-28: patched: Remediation available in version 1.9.0

## References

- [https://www.ibm.com/support/pages/node/7271094](https://www.ibm.com/support/pages/node/7271094)

## Related threats

- [IBM Langflow Desktop SSRF via DNS Rebinding](https://junglewise.ai/threats/cve-2026-3341-ibm-langflow-desktop-ssrf-via-dns-rebinding)
- [IBM Langflow Desktop code injection in code validation endpoint](https://junglewise.ai/threats/cve-2026-6543-ibm-langflow-desktop-code-injection-in-code-validation-endpoint)
- [IBM Langflow Desktop IDOR in image download endpoint](https://junglewise.ai/threats/cve-2026-4503-ibm-langflow-desktop-idor-in-image-download-endpoint)
- [IBM Langflow Desktop path traversal in v2 API](https://junglewise.ai/threats/cve-2026-4502-ibm-langflow-desktop-path-traversal-in-v2-api)
- [IBM Langflow Desktop stored XSS in Markdown rendering](https://junglewise.ai/threats/cve-2026-3346-ibm-langflow-desktop-stored-xss-in-markdown-rendering)