EUVD-2026-21376CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
LiteLLM through 2026-04-08 allows remote attackers to execute arbitrary code via bytecode rewriting at the /guardrails/test_custom_code URI.
Analysis
Remote code execution in BerriAI LiteLLM (all versions through 2026-04-08) enables authenticated attackers to execute arbitrary code by exploiting bytecode rewriting functionality at the /guardrails/test_custom_code endpoint. The vulnerability requires low-privilege authentication (PR:L) but permits complete system compromise with high impact to confidentiality, integrity, and availability. …
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Remediation
Within 24 hours: Inventory all BerriAI LiteLLM deployments and identify instances running versions through 2026-04-08; restrict network access to the /guardrails/test_custom_code endpoint to authorized administrators only via firewall or API gateway rules. Within 7 days: Disable the guardrails testing functionality entirely if not operationally required, or implement application-level access controls limiting endpoint usage to administrative accounts; monitor logs for suspicious activity on this endpoint. …
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