CVE-2026-45227HIGH 8.8EPSS p13.2%

CVE-2026-45227CVE-2026-45227

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.

Scoring

CVSS 3.18.8 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS0.23% probability of exploitation · percentile 13.2% · 2026-06-19T12:03:05Z
Published2026-05-12
Last modified2026-05-14

Underlying weaknesses· 1

CWE-693

References

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

1

TypeTargetConfidenceTier
WeaknessProtection Mechanism Failurecwe-6930%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.