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Vulnerability · Published May 13, 2026 · Assigned by GitHub_M

CVE-2026-45411vm2: Sandbox Breakout Using Async Generator

Critical 9.8

In plain English

A critical-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 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.6%top 52.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.3, it is possible to catch a host exception using the yield* expression inside an async generator. When the generator is closed using the return function, the value is awaited on and exceptions thrown in the then call will be caught by the runtime and passed to the yield* iterator as the next value. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system. This vulnerability is fixed in 3.11.3.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmvm23.11.3GHSA-248r-7h7q-cr24

Affected products (as reported)

VendorProductVersions
patriksimek vm2 < 3.11.3

Weakness: CWE-668, CWE-237 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References