Listen to this Post
CVE-2026-12946 is a critical remote code execution vulnerability affecting IBM Langflow OSS versions 1.0.0 through 1.10.0. The flaw resides in the CUGA (ConfigUrable Generalist Agent) component, specifically within the CodeAgent’s Python code execution path. When a flow utilizing CUGA’s CodeAgent is created and executed, an authenticated attacker can inject arbitrary code that gets executed on the server. The root cause is improper control of user-supplied code (CWE-94), where the application fails to adequately sanitize or sandbox the input before passing it to Python’s execution mechanisms.
The vulnerability leverages object graph introspection techniques to bypass security validators. By crafting a malicious payload, an attacker can recover restricted Python modules that are normally inaccessible, effectively escaping any intended restrictions. Once the validation is bypassed, the attacker’s code is executed within the context of the Langflow server process, which typically runs with elevated privileges. This allows the attacker to perform arbitrary system commands, read sensitive files, modify data, and pivot to other internal systems.
IBM assigned a CVSS base score of 9.9 (Critical) with the vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. This indicates the attack is network-exploitable, requires low complexity, needs low-privileged authentication, does not require user interaction, and can lead to a complete compromise of confidentiality, integrity, and availability. The vulnerability was publicly disclosed on July 30, 2026, with an initial security bulletin published by IBM on July 2, 2026. The fix was merged via a GitHub pull request that introduced a security guard mechanism to validate code before execution, blocking object-graph escape payloads and suspicious import patterns. The patch is available in Langflow OSS version 1.10.1. No public proof-of-concept has been observed, but the vulnerability is considered highly exploitable given the simplicity of the attack vector. Organizations running affected versions are strongly urged to upgrade immediately, as no effective workarounds exist.
DailyCVE Form:
Platform: IBM Langflow OSS
Version: 1.0.0 – 1.10.0
Vulnerability: Remote Code Execution (Code Injection)
Severity: Critical (CVSS 9.9)
date: 2026-07-30
Prediction: Patched in 1.10.1 (2026-07-02)
What Undercode Say:
Analytics:
- Check current Langflow version: `pip show langflow | grep Version`
– Verify if CUGA component is enabled: `grep -r “CUGA” /path/to/langflow/config`
– Test for vulnerable endpoint (authenticated): `curl -X POST http://target:7860/api/v1/validate/code -H “Authorization: Bearer” -d ‘{“code”:”import os; os.system(\”id\”)”}’`
– Monitor logs for suspicious exec() calls: `grep -i “exec” /var/log/langflow/app.log`
– Check for unauthorized flow creations: `auditd -k langflow_flows`
Exploit:
An authenticated attacker can exploit this vulnerability by sending a crafted POST request to the `/api/v1/validate/code` endpoint (or via the CUGA CodeAgent flow execution). The payload leverages Python’s built-in `exec()` function to run arbitrary commands. For example, the attacker can inject code that imports the `os` module and executes system commands like os.system('whoami'). By chaining object-graph introspection techniques, the attacker can bypass the security validators that attempt to restrict certain modules, ultimately achieving full remote code execution with the privileges of the Langflow server process.
Protection:
- Immediately upgrade to Langflow OSS version 1.10.1, which includes the security guard that validates imports and blocks malicious code patterns.
- If upgrading is not possible, restrict network access to the Langflow API to trusted users and networks only.
- Disable or restrict access to the `/api/v1/validate/code` endpoint if not required for operations.
- Remove or disable the CUGA component if it is not actively used in your environment.
- Apply the principle of least privilege to the Langflow service account to minimize the impact of successful exploitation.
Impact:
Successful exploitation allows an authenticated remote attacker to execute arbitrary system commands with the full privileges of the Langflow server process. This can lead to complete compromise of the affected system, including reading, modifying, or deleting sensitive data, stealing credentials and secrets, installing backdoors, and using the compromised host as a pivot point for lateral movement within the internal network. The attacker can also disrupt operations, cause denial of service, and exfiltrate proprietary information, resulting in significant financial and reputational damage.
🎯Let’s Practice Exploiting & Learn Patching For Free:
🎓 Live Courses & Certifications:
Join Undercode Academy for Verified Certifications
🚀 Request a Custom Project:
Secure, high-velocity infrastructure and disruptive technological engineering. Contact our engineering team for high-tier development and proprietary systems:
[email protected]
💎 Smart Architecture | 🛡️ Secure by Design | ⭐ Trusted by Thousands
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
