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CVE-2026-57120 is a sandbox bypass vulnerability in the PraisonAI Python package praisonaiagents, affecting the execute_code functionality when used in sandbox mode. The sandbox’s blocklist-based restrictions on sensitive Python dunder attributes can be bypassed through runtime string assembly combined with Python str.format attribute resolution at the C level. This allows access to attributes that were intended to be denied, including interpreter and object metadata such as class, qualname, bases, base, globals, and dict. The issue undermines the intended isolation model by permitting untrusted code to read restricted internal attributes despite sandbox enforcement.
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