# CVE-2026-77819: IBM Langflow OSS path traversal arbitrary file overwrite

Source: https://junglewise.ai/threats/cve-2026-77819-ibm-langflow-oss-1-0-0-through-1-12-3-could-allow-a-remote  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-29. Updated: 2026-10-29  
License: CC BY 4.0 with a link back

CVE-2026-77819 · Severity: medium · CVSS 6.5 · Published 2026-10-29

IBM Langflow OSS is a workflow automation platform that allows users to build and execute data pipelines. An authenticated attacker can exploit a path traversal flaw to overwrite arbitrary files on the system, potentially compromising application integrity or data. This requires valid credentials but no additional user interaction to execute.

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

## Quick answers

**Is CVE-2026-77819 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77819 being exploited in the wild.

**How severe is CVE-2026-77819?** Medium severity, with a CVSS score of 6.5, published 29 October 2026.

**Which products and versions are affected?** IBM Langflow OSS 1.0.0 through 1.12.3.

**Is there a fix for CVE-2026-77819?** 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-2026-77819 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-77819?** Check whether you run IBM Langflow OSS 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 classic CWE-22 path traversal issue where the application fails to properly validate or sanitize file paths before writing files. An authenticated attacker can craft malicious path inputs to escape directory restrictions and write to arbitrary locations. The attack requires valid authentication credentials and network access to the application.

## Affected products

- IBM Langflow OSS 1.0.0 through 1.12.3

## Timeline

- 2026-10-29: disclosed

## References

- [https://www.ibm.com/support/pages/node/7293015](https://www.ibm.com/support/pages/node/7293015)

## 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 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)
- [IBM Langflow OSS code injection in public workflow execution](https://junglewise.ai/threats/cve-2026-18894-ibm-langflow-oss-1-0-0-through-1-12-4-could-allow-a-remote)