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TI-2026-65003 Aliases CVE-2026-100865GHSA-grmf-qq9c-vgpp

Heym before 0.0.53 Remote Code Execution via eval() Sandbox Escape

Priority HIGH 73CWE-94Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

Heym before 0.0.53 evaluates workflow condition expressions using Python's eval() with insufficient sandboxing in the workflow executor service. Authenticated users can edit workflow condition nodes or import malicious templates to execute arbitrary Python and OS commands as the backend process user.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00399 34th percentileScored 2026-11-07
Fix Fixed heym (heymrun): 0.0.53

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 0.0.530.0.53Patch availableCNA
  • heym Vendorheymrun Affected before 0.0.53 Fixed in 0.0.53 Patch available CNA

Remediation

  • Fix · CNA heym (heymrun) Fixed in 0.0.53

Fixed in the same release

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

  • Advisory ·

    heymrun heym — GitHub Security Advisory (GHSA-pm6h-x3h5-j38h)

    3 records Highest priority Priority HIGH 3 HIGH

    Other records, highest priority first

    • TI-2026-65083 Heym before 0.0.53 Authentication Bypass via Telegram WebhookPriority HIGH 69
    • TI-2026-65082 Heym before 0.0.53 Slack Webhook Signature Verification BypassPriority HIGH 69
    Show all 3 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-100865
  2. 2026-10-03 Alias added: GHSA-grmf-qq9c-vgpp

References

Patch 1

Advisory 1

  • TI-2026-71768 Sandbox escape in heym Python tool allows command execution CVSS 3.1HIGH 8.8
  • TI-2026-65002 heym before 0.0.91 Remote Code Execution via Expression Engine CVSS 4.0HIGH 8.7
  • TI-2026-33042 Heym < 0.0.21 Sandbox Escape via Python Introspection 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