CVE-2026-92953
Description
A flaw was found in vm2. The sandbox fails to properly isolate host object structures from untrusted code running inside the virtual machine. An attacker can exploit this issue by manipulating object prototype chains to modify shared host prototypes, resulting in prototype pollution (the unauthorized alteration of base object properties). This flaw allows an attacker to compromise the integrity of host-created objects after execution completes, potentially leading to unauthorized data alteration or a denial of service (DoS).
Statement
Red Hat Product Security rates this vulnerability as an Important severity issue because untrusted JavaScript code executed within the sandbox can escape isolation boundaries and tamper with the host runtime environment. Exploitation allows code running in the sandboxed context to modify shared object prototypes, undermining the integrity and availability of the surrounding Node.js application. While exploitation requires the ability to supply code for evaluation, the resulting blast radius allows complete compromise of the host process without requiring elevated system privileges.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 9.3 | N/A | 10 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Changed | N/A | Changed |
| Confidentiality | None | N/A | None |
| Integrity Impact | Low | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Other,Integrity
Technical Impact: Varies by Context; Alter Execution Logic
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