RCE in IBM Langflow Oss

CVE-2026-13435

IBM Langflow OSS 1.0.0 through 1.10.1 contains an improper input validation vulnerability in the PythonREPL sandbox implementation.

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.003 (21.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Ibm Langflow Oss — versions 1.0.0
Langflow

Weakness classification (CWE)

CWE-94 — Code Injection

References

psirt@us.ibm.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-13435?: CVE-2026-13435 is a critical-severity vulnerability in IBM Langflow Oss, classified under Code Injection. CVSS score: 9.9/10. Published 2026-07-30.
How severe is CVE-2026-13435?: Critical severity. CVSS v3 base score is 9.9 out of 10.