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TI-2026-33042 Aliases CVE-2026-45227GHSA-vhhj-j98h-xx8p

Heym < 0.0.21 Sandbox Escape via Python Introspection

Priority HIGH 73CWE-693Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-693.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00289 21st percentileScored 2026-11-07
Fix Fixed heym (heymrun): 0.0.21

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
heymrunheymbefore 0.0.210.0.21Patch availableCNA
  • heym Vendorheymrun Affected before 0.0.21 Fixed in 0.0.21 Patch available CNA

Remediation

  • Fix · CNA heym (heymrun) Fixed in 0.0.21

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    heymrun heym 0.0.21

    3 records Highest priority Priority HIGH 2 HIGH, 1 LOW

    Other records, highest priority first

    • TI-2026-33040 Heym < 0.0.21 Path Traversal File Upload via upload_file()Priority HIGH 65
    • TI-2026-33041 Heym < 0.0.21 Authorization Bypass in Workflow ExecutionPriority LOW 35
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-45227
  2. 2026-10-03 Alias added: GHSA-vhhj-j98h-xx8p

References

Patch 2

Other 1

  • TI-2026-71768 Sandbox escape in heym Python tool allows command execution CVSS 3.1HIGH 8.8
  • TI-2026-65003 Heym before 0.0.53 Remote Code Execution via eval() Sandbox Escape CVSS 4.0HIGH 8.7
  • TI-2026-65002 heym before 0.0.91 Remote Code Execution via Expression Engine CVSS 4.0HIGH 8.7
  • TI-2026-65083 Heym before 0.0.53 Authentication Bypass via Telegram Webhook CVSS 4.0HIGH 8.3
  • TI-2026-65082 Heym before 0.0.53 Slack Webhook Signature Verification Bypass CVSS 4.0HIGH 8.3
  • TI-2026-64996 heym before 0.0.109 Server-Side Request Forgery via Workflow Nodes CVSS 4.0HIGH 7.6
See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences