What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-13 · updated 2026-10-26
• Weakness: CWE-668

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 products

• patriksimek vm2: before 3.11.3 — fixed in 3.11.3

How to fix

Upgrade to a fixed version: patriksimek vm2 3.11.3. Check the vendor advisory for mitigations.

References

• https://github.com/patriksimek/vm2/security/advisories/GHSA-248r-7h7q-cr24
• https://access.redhat.com/errata/RHSA-2026:50850
• https://access.redhat.com/security/cve/CVE-2026-45411
• https://bugzilla.redhat.com/show_bug.cgi?id=2477210
• https://github.com/patriksimek/vm2/security/advisories/GHSA-248r-7h7q-cr24
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45411.json

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