# CVE-2026-13435: IBM Langflow OSS code injection in PythonREPL sandbox

Source: https://junglewise.ai/threats/cve-2026-13435-ibm-langflow-oss-code-injection-in-pythonrepl-sandbox  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-30. Updated: 2026-07-30  
License: CC BY 4.0 with a link back

CVE-2026-13435 · Severity: critical · CVSS 9.9 · Published 2026-07-30

IBM Langflow OSS, a tool used to build and manage AI workflows, contains a security flaw in its Python code execution component. An attacker with basic access can bypass security restrictions to run unauthorized code on the server. This could lead to the theft of sensitive information, including API keys, database credentials, and encryption keys used to secure user sessions.

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

## Quick answers

**Is CVE-2026-13435 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-13435 being exploited in the wild.

**How severe is CVE-2026-13435?** Critical severity, with a CVSS score of 9.9, published 30 July 2026.

**Which products and versions are affected?** IBM Langflow OSS 1.0.0 through 1.10.1.

**Is there a fix for CVE-2026-13435?** A patch was published on 2026-07-14: Fix released in version 1.10.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-13435 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-13435?** 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

A code injection vulnerability (CWE-94) exists in the Python Interpreter and legacy Python REPL Tool components of IBM Langflow OSS. The vulnerability stems from improper input validation in the sandbox implementation, which is intended to restrict code execution to a safe environment with limited imports and built-ins. An authenticated attacker can provide crafted input to a flow or agent that bypasses these restrictions. Successful exploitation allows the attacker to execute arbitrary code, potentially leading to the exposure of environment variables, provider API keys, database credentials, and JWT symmetric signing keys. The issue is resolved in version 1.10.2.

## Affected products

- IBM Langflow OSS 1.0.0 through 1.10.1

## Timeline

- 2026-07-14: disclosed: Initial publication of the security bulletin by IBM
- 2026-07-14: patched: Fix released in version 1.10.2
- 2026-07-30: advisory: NVD publication date

## References

- [https://www.ibm.com/support/pages/node/7279987](https://www.ibm.com/support/pages/node/7279987)

## 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)