# CVE-2025-24359: python-asteval: ASTEVAL is an evaluator of Python expressions and statements

CVE-2025-24359 is fixed in python-asteval on 1 platform, first by DEBIAN-CVE-2025-24359, released January 24, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-24359
- Priority: High
- CVSS: 8.4 (high)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 24, 2025

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-asteval Debian 13.5 (trixie) | 1.0.6-2 | [DEBIAN-CVE-2025-24359](https://patchblox.com/security/data/fix/linux/debian-cve-2025-24359.md) | Jan 24, 2025 |
| Linux | python-asteval Debian 14 | 1.0.6-2 | [DEBIAN-CVE-2025-24359](https://patchblox.com/security/data/fix/linux/debian-cve-2025-24359.md) | Jan 24, 2025 |
| Linux | python-asteval opensuse-leap 15.6 | 1.0.6-bp156.4.3.1 | [OPENSUSE-SU-2025:0052-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-0052-1.md) | Feb 3, 2025 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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