CVE-2026-92949 Details
Description
vm2 versions from 3.9.6 before 3.11.7 fail to properly restrict access to accessor properties on frozen objects, allowing sandboxed scripts to bypass vm.freeze() and vm.readonly() protections. Attackers can use Object.getOwnPropertyDescriptor() or __lookupSetter__() to extract and invoke host object setters directly, mutating properties the embedder explicitly marked read-only.
A vulnerability exists in vm2 versions 3.9.6 prior to 3.11.7, allowing sandboxed scripts to bypass the protections of vm.freeze() and vm.readonly(). This issue arises because the library fails to properly restrict access to accessor properties on frozen objects. As a result, scripts can use Object.getOwnPropertyDescriptor() or __lookupSetter__() to access and invoke host object setters directly, altering properties that the embedder has designated as read-only.
Users can upgrade to vm2 version 3.11.7, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 17, 2026CISA-ADP
Assessed Sep 21, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/patriksimek/vm2/security/advisories/GHSA-633r-hq9m-c4ff | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/patriksimek/vm2/security/advisories/GHSA-633r-hq9m-c4ff | [email protected] | AdvisoryExploitRemedyVendor |
| https://www.vulncheck.com/advisories/vm2-3.9.6-before-3.11.7-sandbox-bypass-via-accessor-descriptor | [email protected] | Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-471 | Modification of Assumed-Immutable Data (MAID) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| vm2 | >= 3.9.6, <= 3.11.6 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 21, 2026 | CVE Modified | CISA-ADP |
| Sep 17, 2026 | New CVE Received | [email protected] |