GitHub Advisoryadvisory · PyPI
GHSA-44vg-5wv2-h2hg SimpleEval: Objects (including modules) can leak dangerous modules through to direct access inside the sandbox
HIGH
Official page ↗
- Aliases
- CVE-2026-32640
- Ecosystem
- PyPI
- Packages
- simpleeval
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-915, CWE-94
- Reviewed
- 2026-03-13
Affected packages
• PyPI simpleeval: < 1.0.5 → fixed in 1.0.5
Description
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)
Related
Alias · CVE (1)
- CVE-2026-32640 SimpleEval is a library for adding evaluatable expressions into python projects. vulnerability
References
- https://github.com/danthedeckie/simpleeval/security/advisories/GHSA-44vg-5wv2-h2hg web
- https://nvd.nist.gov/vuln/detail/CVE-2026-32640 advisory
- https://github.com/danthedeckie/simpleeval package
- https://github.com/danthedeckie/simpleeval/releases/tag/1.0.5 web
- https://github.com/pypa/advisory-database/tree/main/vulns/simpleeval/PYSEC-2026-132.yaml web
- https://lists.debian.org/debian-lts-announce/2026/04/msg00023.html web