CVE-2026-4963: Huggingface Smolagents

Critical severity, CVSS 10.0. EPSS: 0.7% chance of exploitation in the next 30 days.

A weakness has been identified in huggingface smolagents 1.25.0.dev0. This affects the function evaluate_augassign/evaluate_call/evaluate_with of the file src/smolagents/local_python_executor.py of the component Incomplete Fix CVE-2025-9959. This manipulation causes code injection. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products

• Huggingface Smolagents: version 1.25.0 only

Published 2026-03-27. Last modified 2026-06-17.