asteval sandbox escape: arbitrary native memory read/write via numpy ctypes in default asteval Interpreter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102734
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-13 16:17:09 UTC
Updated2026-10-16 20:04:29 UTC
Descriptionasteval 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS: 0.001280000 probability, percentile 0.021870000 (date 2026-10-16)

Problem Types: CWE-693 | CWE-749 | CWE-913 | CWE-693 CWE-693: Protection Mechanism Failure | CWE-749 CWE-749: Exposed Dangerous Method or Function | CWE-913 CWE-913: Improper Control of Dynamically-Managed Code Resources

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.1CNADECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Lmfit Asteval affected < 1.0.9 Not specified

References

ReferenceSourceLinkTags
github.com/lmfit/asteval/security/advisories/GHSA-9w56-46f6-3qhx [email protected] github.com
github.com/lmfit/asteval/releases/tag/1.0.9 [email protected] github.com
github.com/lmfit/asteval/pull/153 [email protected] github.com
github.com/lmfit/asteval/commit/a3e56e7f8ed567a4817684d94213b290359077b4 [email protected] github.com
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