heym before 0.0.91 contains a sandbox escape vulnerability in the expression engine's DotList map/filter and fallback resolver that allows… (CVE-2026-100864)
heym versions before 0.0.91 have a sandbox escape vulnerability in the expression engine's DotList map/filter and fallback resolver. This flaw allows authenticated users to execute arbitrary Python code by exploiting dunder attribute access to invoke os.system, leading to command execution as the backend process.
AI Analysis
Technical Summary
The vulnerability in heym prior to version 0.0.91 involves the expression engine's DotList map/filter and fallback resolver components. Authenticated attackers can craft workflow expressions that use dunder attribute access through item expressions or the fallback resolver to reach os.system, enabling arbitrary command execution on the backend. This constitutes a sandbox escape, bypassing intended execution restrictions.
Potential Impact
Successful exploitation allows an authenticated user to execute arbitrary Python code and system commands with the privileges of the backend process, potentially leading to full system compromise, data loss, or service disruption.
Mitigation Recommendations
A fix is available in heym version 0.0.91. Users should upgrade to version 0.0.91 or later to remediate this vulnerability. No additional mitigation guidance is provided or required beyond applying this update.
heym before 0.0.91 contains a sandbox escape vulnerability in the expression engine's DotList map/filter and fallback resolver that allows… (CVE-2026-100864)
Description
heym versions before 0.0.91 have a sandbox escape vulnerability in the expression engine's DotList map/filter and fallback resolver. This flaw allows authenticated users to execute arbitrary Python code by exploiting dunder attribute access to invoke os.system, leading to command execution as the backend process.
CVSS v3.1
Score 8.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in heym prior to version 0.0.91 involves the expression engine's DotList map/filter and fallback resolver components. Authenticated attackers can craft workflow expressions that use dunder attribute access through item expressions or the fallback resolver to reach os.system, enabling arbitrary command execution on the backend. This constitutes a sandbox escape, bypassing intended execution restrictions.
Potential Impact
Successful exploitation allows an authenticated user to execute arbitrary Python code and system commands with the privileges of the backend process, potentially leading to full system compromise, data loss, or service disruption.
Mitigation Recommendations
A fix is available in heym version 0.0.91. Users should upgrade to version 0.0.91 or later to remediate this vulnerability. No additional mitigation guidance is provided or required beyond applying this update.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-gxgj-2794-2q5v
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-100864"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6ab89bbcf7a7c54106941ea6
Added to database: 09/27/2026, 04:29:48 UTC
Last enriched: 09/27/2026, 04:35:03 UTC
Last updated: 09/27/2026, 05:27:37 UTC
Views: 4
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