CVE-2026-92955: Improper Control of Dynamically-Managed Code Resources in patriksimek vm2
CVE-2026-92955 is a critical sandbox escape vulnerability in the patriksimek vm2 library before version 3.11.8. It allows attackers to access the host __proto__ getter/setter via console._stdout and console._stderr, enabling them to overwrite EventEmitter.prototype.emit and trigger process events. This leads to arbitrary code execution with process privileges, bypassing code generation restrictions.
AI Analysis
Technical Summary
The vulnerability in vm2 versions prior to 3.11.8 involves improper control of dynamically-managed code resources within the NodeVM sandbox. Attackers can exploit access to the host __proto__ getter/setter through console._stdout and console._stderr to overwrite EventEmitter.prototype.emit. By triggering process events, attackers can execute arbitrary code with the process context, effectively escaping the sandbox and bypassing code generation restrictions.
Potential Impact
Successful exploitation results in sandbox escape and arbitrary code execution with the privileges of the Node.js process running vm2. This can lead to full compromise of the host environment where the vulnerable vm2 instance is running.
Mitigation Recommendations
A fix is available in vm2 version 3.11.8. Users should upgrade to version 3.11.8 or later to remediate this vulnerability. No other mitigation guidance is provided or required.
CVE-2026-92955: Improper Control of Dynamically-Managed Code Resources in patriksimek vm2
Description
CVE-2026-92955 is a critical sandbox escape vulnerability in the patriksimek vm2 library before version 3.11.8. It allows attackers to access the host __proto__ getter/setter via console._stdout and console._stderr, enabling them to overwrite EventEmitter.prototype.emit and trigger process events. This leads to arbitrary code execution with process privileges, bypassing code generation restrictions.
CVSS v4.0
Score 10.0critical
Affected software
patriksimek
vm2
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in vm2 versions prior to 3.11.8 involves improper control of dynamically-managed code resources within the NodeVM sandbox. Attackers can exploit access to the host __proto__ getter/setter through console._stdout and console._stderr to overwrite EventEmitter.prototype.emit. By triggering process events, attackers can execute arbitrary code with the process context, effectively escaping the sandbox and bypassing code generation restrictions.
Potential Impact
Successful exploitation results in sandbox escape and arbitrary code execution with the privileges of the Node.js process running vm2. This can lead to full compromise of the host environment where the vulnerable vm2 instance is running.
Mitigation Recommendations
A fix is available in vm2 version 3.11.8. Users should upgrade to version 3.11.8 or later to remediate this vulnerability. No other mitigation guidance is provided or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-17T12:43:31.527Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aabfa1555bf5e2cf57f75ec
Added to database: 09/17/2026, 14:32:53 UTC
Last enriched: 09/17/2026, 14:46:34 UTC
Last updated: 09/17/2026, 14:49:23 UTC
Views: 6
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