Protection Mechanism Failure Affecting python-asteval package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-PYTHONASTEVAL-20941654
- published15 Oct 2026
- disclosed13 Oct 2026
Introduced: 13 Oct 2026
NewCVE-2026-102734 (opens in a new tab)How to fix?
There is no fixed version for Debian:12 python-asteval.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python-asteval package and not the python-asteval package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-102734
- https://github.com/lmfit/asteval/commit/a3e56e7f8ed567a4817684d94213b290359077b4
- https://github.com/lmfit/asteval/pull/153
- https://github.com/lmfit/asteval/releases/tag/1.0.9
- https://github.com/lmfit/asteval/security/advisories/GHSA-9w56-46f6-3qhx