CVE-2026-45227 Details
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.
A sandbox escape vulnerability has been identified in Heym versions prior to 0.0.21. This vulnerability allows authenticated workflow authors to bypass sandbox restrictions using object-graph introspection techniques. By exploiting this issue, attackers can access the unrestricted __import__ function, import prohibited modules like os and subprocess, and retrieve sensitive backend environment variables containing database credentials and encryption keys. This access could be used to execute arbitrary commands on the host system as the backend service user.
Users can update to Heym version 0.0.21 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 12, 2026CISA-ADP
Assessed May 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/heymrun/heym/pull/94 | CISA-ADP | Issue TrackingVendor |
| https://github.com/heymrun/heym/commit/32b7e809d987d9b018ec8daa2cdaf48f627f26f1 | [email protected] | Source CodeVendor |
| https://github.com/heymrun/heym/pull/94 | [email protected] | Issue TrackingVendor |
| https://github.com/heymrun/heym/releases/tag/v0.0.21 | [email protected] | Release NotesVendor |
| https://www.vulncheck.com/advisories/heym-sandbox-escape-via-python-introspection | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-693 | Protection Mechanism Failure | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Heym | All versions |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 14, 2026 | CVE Modified | CISA-ADP |
| May 12, 2026 | New CVE Received | [email protected] |