CVE-2025-24359 – ASTEVAL Vulnerable to Maliciously Crafted Format Strings Leading to Sandbox Escape

https://notcve.org/view.php?id=CVE-2025-24359

24 Jan 2025 — ASTEVAL is an evaluator of Python expressions and statements. Prior to version 1.0.6, if an attacker can control the input to the `asteval` library, they can bypass asteval's restrictions and execute arbitrary Python code in the context of the application using the library. The vulnerability is rooted in how `asteval` performs handling of `FormattedValue` AST nodes. In particular, the `on_formattedvalue` value uses the dangerous format method of the str class. The code allows an attacker to manipulate the v... • https://github.com/lmfit/asteval/blob/cfb57f0beebe0dc0520a1fbabc35e66060c7ea71/asteval/asteval.py#L507 • CWE-134: Use of Externally-Controlled Format String CWE-749: Exposed Dangerous Method or Function •