lmfit asteval up to 1.0.8 Interpreter asteval/astutils.py escape output

Summaryinfo

A vulnerability has been found in lmfit asteval up to 1.0.8 and classified as problematic. Impacted is an unknown function of the file asteval/astutils.py of the component Interpreter. This manipulation causes escape output. This vulnerability appears as CVE-2026-102734. The attack requires local access. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in lmfit asteval up to 1.0.8. Affected by this vulnerability is an unknown part of the file asteval/astutils.py of the component Interpreter. The manipulation with an unknown input leads to a escape output vulnerability. The CWE definition for the vulnerability is CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. As an impact it is known to affect availability. The summary by CVE is:

asteval is a Python expression evaluator designed for restricted execution. Prior to 1.0.9, in asteval/astutils.py, the default Interpreter with numpy enabled exposes a ctypes type and permits from_address memory access. safe_getattr blocks the ctypes module but not reachable ctypes type objects, while attribute assignments use unfiltered setattr instead of safe_setattr. An attacker-controlled expression can derive an address with id, read memory through from_address, and write through an attribute assignment. The expression can read or corrupt arbitrary process memory, escape the intended sandbox, execute code, disclose secrets, or crash the host process. This issue is fixed in version 1.0.9.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-102734 since 09/29/2026. The exploitation appears to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.0.9 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• lmfit

Name

• asteval

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8

Website

• Product: https://github.com/lmfit/asteval/

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