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CVE-2026-100864

8.8 HIGHpublic exploit available

Published 2026-09-27 · Updated 2026-09-28

AI risk analysis

Summary
This vulnerability allows authenticated users to execute arbitrary Python code through the expression engine's DotList map/filter and fallback resolver, posing a significant risk due to the potential for remote code execution.
Exploitability
Exploitation is relatively straightforward for attackers who can craft workflow expressions to access os.system and execute commands. Precondition is the user must be authenticated and have access to the affected feature.
Blast radius
If exploited, the impact could be severe, as it allows for arbitrary command execution, potentially leading to full system compromise.
Detection
No reliable host or network indicator is derivable from the published description.
Prioritized remediation
Upgrade to version 0.0.91 or later.
rceauth-bypasspythonexpression-engine

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-94

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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