SimpleEval: Objects (including modules) can leak dangerous modules through to direct access inside the sandbox
Impact
If the objects passed in as names to SimpleEval have modules or other disallowed / dangerous objects available as attrs.
Additionally, dangerous functions or modules could be accessed by passing them as callbacks to other safe functions to call.
Examples (found by @ByamB4):
Any module where non-underscore attribute chains reach os or sys:
- os.path, pathlib, shutil, glob (direct .os / .sys attributes)
- statistics (has .sys)
- numpy (has .ctypeslib.os and .f2py.sys)
- urllib.parse (has .warnings.sys)
Patches
The latest version 1.0.5 has this issue fixed.
Workarounds
Don't pass in objects or modules which have direct attributes to potentially dangerous items. Use a wrapper to wrap the potentially vulnerable items (See the ModuleWrapper in version 1.0.5)
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | simpleeval | < 1.0.5 | 1.0.5 |
References
- https://lists.debian.org/debian-lts-announce/2026/04/msg00023.html
- https://github.com/danthedeckie/simpleeval/security/advisories/GHSA-44vg-5wv2-h2hg
- https://nvd.nist.gov/vuln/detail/CVE-2026-32640
- https://github.com/danthedeckie/simpleeval
- https://github.com/danthedeckie/simpleeval/releases/tag/1.0.5
- https://github.com/pypa/advisory-database/tree/main/vulns/simpleeval/PYSEC-2026-132.yaml
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-915, CWE-94- Platform
- Python (PyPI)
- Package
simpleeval- Disclosed
- 13.03.2026
- Updated
- 11.10.2026 12:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-132 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-44vg-5wv2-h2hg - CC BY 4.0
Vulnerability history: simpleeval
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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