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.

The remote Fedora 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-83c141f000 advisory.

    Fix CVE-2025-24359 (closes rhbz#2341976)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-99d252d8fc advisory.

    Automatic update for python-asteval-1.0.6-1.fc43.

    ##### **Changelog**

    ```
    * Wed Jul  9 2025 Fabian Affolter <mail@fabian-affolter.ch> - 1.0.6-1
    - Update to latest upstream release (closes rhbz#2338907)
    - Fix CVE-2025-24359 (closes rhbz#2341976)

    ```

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2025-24359)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
242289	Fedora 42 : python-asteval (2025-83c141f000)	Nessus	Fedora Local Security Checks	high
241666	Fedora 43 : python-asteval (2025-99d252d8fc)	Nessus	Fedora Local Security Checks	high
231176	Linux Distros Unpatched Vulnerability : CVE-2025-24359	Nessus	Misc.	high

Detections

Analytics

CVE-2025-24359

high

Tenable Plugins

high

high

high