Heym before 0.0.21 contains a sandbox escape vulnerability in the custom Python tool executor that allows authenticated workflow authors to bypass sandbox restrictions by using object-graph introspection primitives. Attackers can use Python introspection techniques to recover the unrestricted __import__ function, import blocked modules such as os and subprocess, and access inherited backend environment variables containing database credentials and encryption keys to execute arbitrary host commands as the backend service user.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
heymrun heym affected
Version Status Constraints
0 affected < 0.0.21
32b7e809d987d9b018ec8daa2cdaf48f627f26f1 unaffected —

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/heymrun/heym/commit/32b7e809d987d9b018ec8daa2cdaf48f627f26f1 cve-icon cve-icon
https://github.com/heymrun/heym/pull/94 cve-icon cve-icon
https://github.com/heymrun/heym/releases/tag/v0.0.21 cve-icon cve-icon
https://www.vulncheck.com/advisories/heym-sandbox-escape-via-python-introspection cve-icon cve-icon
History

Tue, 12 May 2026 22:00:00 +0000

Type Values Removed Values Added
Description Heym before 0.0.21 contains a sandbox escape vulnerability in the custom Python tool executor that allows authenticated workflow authors to bypass sandbox restrictions by using object-graph introspection primitives. Attackers can use Python introspection techniques to recover the unrestricted __import__ function, import blocked modules such as os and subprocess, and access inherited backend environment variables containing database credentials and encryption keys to execute arbitrary host commands as the backend service user.
Title Heym < 0.0.21 Sandbox Escape via Python Introspection
Weaknesses CWE-693
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-12T21:18:34.901Z

Reserved: 2026-05-11T14:14:49.611Z

Link: CVE-2026-45227

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-12T22:16:38.260

Modified: 2026-05-12T22:16:38.260

Link: CVE-2026-45227

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-12T23:45:25Z

Weaknesses