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CVE

CVE-2026-32640

SimpleEval: Objects (including modules) can leak dangerous modules through to direct access inside the sandbox
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CVE

CVE-2026-32640

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)

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.7
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

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

Severity

9.8

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
9.8
EPSS Probability
0.00048%
EPSS Percentile
0.14572%
Introduced Version
0
Fix Available
1.0.5

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