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8.7

heymrun heym lets logged‑in users run arbitrary code

CVE-2026-100864 · published 22 days ago
Summary

Versions of heym before 0.0.91 let anyone with a valid account craft special expressions that break out of the sandbox and run any Python command on the server. This could let an attacker control the system that hosts the application. Upgrade to version 0.0.91 or later, or apply the vendor’s patch, to stop the issue.

What to do
  • Update heymrun heym to version 0.0.91 or later.
Affected software
VendorProductAffected versions
heymrun heym < 0.0.91
Original advisory text
heym before 0.0.91 Remote Code Execution via Expression Engine
heym before 0.0.91 contains a sandbox escape vulnerability in the expression engine's DotList map/filter and fallback resolver that allows authenticated users to execute arbitrary Python code. Attackers can craft workflow expressions using dunder attribute access through item expressions or the fallback resolver to access os.system and execute commands as the backend process.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.7 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-94Code Injection
Timeline
Published27 Sep 2026
Updated19 Oct 2026
First seen27 Sep 2026
Sources
CVE-2026-100864 · NVD
CVE-2026-100864 · MITRE
CVE-2026-100864 · OSV
GHSA-87x2-9jwx-7gh4 · GHSA
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