IBM Langflow OSS Command Injection Vulnerability

IBM Langflow OSS versions 1.0.0 through 1.10.1 are affected by CVE-2026-14499, an OS command injection vulnerability (CWE-78) within its Python Interpreter component. This flaw stems from improper validation of user-supplied input, allowing an authenticated attacker to inject and execute arbitrary commands with elevated privileges on the underlying system. Successful exploitation leads to remote code execution and potential privilege escalation, giving the attacker control over the host running the Langflow OSS instance. This vulnerability poses a significant risk to organizations using affected versions, enabling unauthorized system access and potential compromise of sensitive data or operational integrity.

Attack Chain

1. Initial Authentication: An attacker obtains valid credentials for a Langflow OSS user account, possibly through phishing, credential stuffing, or other means.
2. Access Python Interpreter Component: The authenticated attacker accesses the vulnerable Python Interpreter component within the Langflow OSS web interface or API.
3. Craft Malicious Input: The attacker prepares input containing OS command injection payloads, such as Python os.system() calls or shell metacharacters like ;, &, | if direct shell execution is possible.
4. Submit Malicious Input: The attacker submits this crafted input to the Python Interpreter component through a web request.
5. Command Execution: Due to improper input validation, the Langflow OSS application executes the injected OS commands within the context of the Python interpreter.
6. Privilege Escalation: The executed commands run with the elevated privileges of the Langflow OSS application, allowing the attacker to perform actions beyond their intended user permissions.
7. System Compromise: The attacker achieves remote code execution and can further compromise the underlying system, leading to data exfiltration, deployment of additional malware, or full system control.

Impact

A successful exploitation of CVE-2026-14499 grants an authenticated attacker the ability to execute arbitrary commands with elevated privileges on the server hosting IBM Langflow OSS. This can lead to complete compromise of the underlying system, including data theft, installation of backdoors, disruption of services, and further lateral movement within the network. The CVSS 3.1 Base Score of 8.8 (High) reflects the severity of this vulnerability, indicating significant impact on confidentiality, integrity, and availability once an attacker gains initial authentication.

Recommendation

• Patch CVE-2026-14499 by upgrading IBM Langflow OSS to a version beyond 1.10.1 as soon as a fix is available from IBM. Refer to the IBM support page at https://www.ibm.com/support/pages/node/7279996 for official guidance.
• Deploy the Sigma rule "Detect CVE-2026-14499 Exploitation Attempt - Langflow OSS Command Injection" to your SIEM and monitor webserver logs for suspicious activity.
• Implement strong authentication policies and restrict access to the Langflow OSS application to trusted users and networks to mitigate the risk of initial authentication compromise.