CVE-2026-102734
mediumasteval is a Python expression evaluator designed for restricted execution.
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.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/lmfit/asteval/commit/a3e56e7f8ed567a4817684d94213b290359077b4 security-advisories@github.com
- https://github.com/lmfit/asteval/pull/153 security-advisories@github.com
- https://github.com/lmfit/asteval/releases/tag/1.0.9 security-advisories@github.com
- https://github.com/lmfit/asteval/security/advisories/GHSA-9w56-46f6-3qhx security-advisories@github.com