CVE-2026-6859: InstructLab Includes Functionality from Untrusted Control Sphere

April 22, 2026 (updated April 29, 2026)

A flaw was found in InstructLab. The linux_train.py script hardcodes trust_remote_code=True when loading models from HuggingFace. This allows a remote attacker to achieve arbitrary Python code execution by convincing a user to run ilab train/download/generate with a specially crafted malicious model from the HuggingFace Hub. This vulnerability can lead to complete system compromise.

References

access.redhat.com/security/cve/CVE-2026-6859
bugzilla.redhat.com/show_bug.cgi?id=2459998
github.com/advisories/GHSA-rxpq-xgqx-fr7p
github.com/instructlab/instructlab
nvd.nist.gov/vuln/detail/CVE-2026-6859

Code Behaviors & Features

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