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CVE-2025-24359

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 value of the string used in the dangerous call `fmt.format(__fstring__=val)`. This vulnerability can be exploited to access protected attributes by intentionally triggering an `AttributeError` exception. The attacker can then catch the exception and use its `obj` attribute to gain arbitrary access to sensitive or protected object properties. Version 1.0.6 fixes this issue.

CVSS 8.4 · High · EPSS 0.3% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • asteval

    Versions
    • < 1.0.6: Affected

    No fix published

  • python-asteval Debian:12

    Versions
    • 0.9.28-1
    • 0.9.30-1
    • 0.9.31-1
    • 1.0.6-1
    • 1.0.6-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-asteval Debian:13

    Affected ranges
    • ECOSYSTEM: < 1.0.6-2

    Update to 1.0.6-2

  • python-asteval Debian:14

    Affected ranges
    • ECOSYSTEM: < 1.0.6-2

    Update to 1.0.6-2

  • asteval PyPI

    Versions
    • 0.9
    • 0.9.1
    • 0.9.10
    • 0.9.11
    • 0.9.12
    • 0.9.13
    • 0.9.14
    • 0.9.15
    • 0.9.16
    • 0.9.17
    • 0.9.18
    • 0.9.19
    • 0.9.2
    • 0.9.20
    • 0.9.21
    • 0.9.22
    • 0.9.23
    • 0.9.24
    • 0.9.25
    • 0.9.26
    • 0.9.27
    • 0.9.28
    • 0.9.29
    • 0.9.3
    • 0.9.30
    • 0.9.31
    • 0.9.32
    • 0.9.33
    • 0.9.4
    • 0.9.5
    • 0.9.6
    • 0.9.7
    • 0.9.8
    • 0.9.9
    • 1.0.0
    • 1.0.1
    • 1.0.2
    • 1.0.3
    • 1.0.4
    • 1.0.5
    Affected ranges
    • ECOSYSTEM: < 1.0.6

    Update to 1.0.6

  • python-asteval Ubuntu:20.04:LTS

    Versions
    • 0.9.12-1
    • 0.9.12-2
    • 0.9.17-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-asteval Ubuntu:22.04:LTS

    Versions
    • 0.9.19-2
    • 0.9.25-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-asteval Ubuntu:24.04:LTS

    Versions
    • 0.9.30-1
    • 0.9.31-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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