CVE-2021-21413

isolated-vm is a library for nodejs which gives you access to v8's Isolate interface. Versions of isolated-vm before v4.0.0 have API pitfalls which may make it easy for implementers to expose supposed secure isolates to the permissions of the main nodejs isolate. Reference objects allow access to the underlying reference's full prototype chain. In an environment where the implementer has exposed a Reference instance to an attacker they would be able to use it to acquire a Reference to the nodejs context's Function object. Similar application-specific attacks could be possible by modifying the local prototype of other API objects. Access to NativeModule objects could allow an attacker to load and run native code from anywhere on the filesystem. If combined with, for example, a file upload API this would allow for arbitrary code execution. This is addressed in v4.0.0 through a series of related changes.

• CWE-913

• https://github.com/laverdet/isolated-vm/blob/main/CHANGELOG.md#v400Release Notes, Third Party Advisory
• https://github.com/laverdet/isolated-vm/commit/2646e6c1558bac66285daeab54c7d490ed332b15Patch, Third Party Advisory
• https://github.com/laverdet/isolated-vm/commit/27151bfecc260e96714443613880e3b2e6596704Patch, Third Party Advisory
• https://github.com/laverdet/isolated-vm/security/advisories/GHSA-mmhj-4w6j-76h7Third Party Advisory
• https://github.com/laverdet/isolated-vm/blob/main/CHANGELOG.md#v400Release Notes, Third Party Advisory
• https://github.com/laverdet/isolated-vm/commit/2646e6c1558bac66285daeab54c7d490ed332b15Patch, Third Party Advisory
• https://github.com/laverdet/isolated-vm/commit/27151bfecc260e96714443613880e3b2e6596704Patch, Third Party Advisory
• https://github.com/laverdet/isolated-vm/security/advisories/GHSA-mmhj-4w6j-76h7Third Party Advisory

Published

Mar 30, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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