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Vulnerability record · CVE-2026-45227 · published 12 May 2026

CVE-2026-45227: Heym before 0.0.21 contains a sandbox escape vulnerability in the custom Python tool executor that allows auth…

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.

8.7 CVSS 4.0 High EPSS 0.40% · top 68.0% CWE-693 · CWE-693 Deferred
8.7CVSS 4.0 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
14 Jul 2026Last modified by NVD

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.

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/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:

References

LinkTags
https://github.com/heymrun/heym/commit/32b7e809d987d9b018ec8daa2cdaf48f627f26f1
https://github.com/heymrun/heym/pull/94
https://github.com/heymrun/heym/releases/tag/v0.0.21
https://www.vulncheck.com/advisories/heym-sandbox-escape-via-python-introspection
https://github.com/heymrun/heym/pull/94

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Source: NIST National Vulnerability Database (record CVE-2026-45227), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.