---
title: "CVE-2026-92934: vm2 sandbox escape to host RCE via revisited host-wrapped AggregateError bypassing Error sanitization cycle short-circuit"
url: https://erroneo.us/security/cve/CVE-2026-92934/
description: "CVE-2026-92934 (vm2 (npm)): vm2 before 3.11.8 contains an incomplete fix for Error.cause sanitization that allows sandbox escape when revisited host-wrapped…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-17
date_modified: 2026-10-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-92934"
kev: false
cvss: 9.5
epss: 0.00762
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-92934: vm2 sandbox escape to host RCE via revisited host-wrapped AggregateError bypassing Error sanitization cycle short-circuit

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.8% , percentile 55: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 55% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes vm2 (npm) <= 3.11.7, fixed in 3.11.8 . Check your lockfile, including transitive dependencies.
- Editorial verdict: Check exposure. vm2: 22 Critical Sandbox Escapes, Fixed in 3.12.2 — If anything outside your trust boundary can get code into vm2, upgrade to 3.12.2 today and plan to move that code out of process; if vm2 only runs your own code, upgrade on a normal cycle.

## What it is

vm2 before 3.11.8 contains an incomplete fix for Error.cause sanitization that allows sandbox escape when revisited host-wrapped AggregateError objects are caught within a single exception handler traversal. Attackers can exploit cycle detection bypass in handleException to access unsanitized host proxies embedded in the errors array, enabling full remote code execution and process information disclosure from the sandbox.

## Affected packages

- npm `vm2` <= 3.11.7 → fixed: 3.11.8

## Affected products (CVE record)

- patriksimek vm2: < 3.11.8

## Severity

- VulnCheck CVSS 4.0: 9.5 `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`
- VulnCheck CVSS 3.1: 9 `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 4.0: 9.5 `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.76% probability of exploitation activity in the next 30 days; percentile 55.

## Sources

- [GitHub Security Advisory (GHSA-x965-fc75-jpqh)](https://github.com/patriksimek/vm2/security/advisories/GHSA-x965-fc75-jpqh)
- [GitHub Advisory GHSA-x965-fc75-jpqh](https://github.com/advisories/GHSA-x965-fc75-jpqh)
- [CVE.org record CVE-2026-92934](https://www.cve.org/CVERecord?id=CVE-2026-92934)
- [NVD entry CVE-2026-92934](https://nvd.nist.gov/vuln/detail/CVE-2026-92934)
- [VulnCheck Advisory: vm2 before 3.11.8 Sandbox Escape RCE via AggregateError](https://www.vulncheck.com/advisories/vm2-before-3.11.8-sandbox-escape-rce-via-aggregateerror)
- [github.com](https://github.com/patriksimek/vm2/commit/c8c232530b860cfecf6f94bc8d0d0890aa381460)
- [github.com](https://github.com/patriksimek/vm2/releases/tag/v3.11.8)

---
Source page: https://erroneo.us/security/cve/CVE-2026-92934/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt