Vulnerability · Published Sep 17, 2026 · Assigned by VulnCheck

CVE-2026-92949vm2 3.9.6 before 3.11.7 Sandbox Bypass via Accessor Descriptor

Medium 4.0

In plain English

A medium-severity security flaw in vm2 from patriksimek. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.0Medium

Exploit odds (30 days)0.3%top 75.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	vm2	3.11.7	GHSA-633r-hq9m-c4ff

Affected products (as reported)

Vendor	Product	Versions
patriksimek	vm2	3.9.6 – before 3.11.7

Weakness: CWE-471 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

References

GitHub Security Advisory (GHSA-633r-hq9m-c4ff) vendor-advisory
VulnCheck Advisory: vm2 3.9.6 before 3.11.7 Sandbox Bypass via Accessor Descriptor third-party-advisory