vm2 sandbox escape via neutralizeArraySpeciesBatch
CVE-2026-44008 is a critical sandbox escape vulnerability in vm2, the Node.js VM/sandbox library. In vm2 versions prior to 3.11.2, the method neutralizeArraySpeciesBatch improperly handles objects originating from the opposite side of the sandbox boundary. Because the vulnerable logic can invoke a getter on the array prototype across that boundary, host-side objects can be exposed into the sandbox context. An attacker can leverage this cross-boundary object exposure to obtain host objects, recover the host Function constructor, break out of the vm2 sandbox, and then execute arbitrary commands on the underlying host system.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A sandbox escape vulnerability in vm2 for Node.js that allows attackers to obtain host objects and the host Function object, leading to arbitrary command execution on the host system.
A critical unpatched vm2 sandbox escape vulnerability that abuses array species handling and exception logic to expose host-side objects and regain access to the host Function constructor.
A critical vm2 sandbox escape vulnerability via neutralizeArraySpeciesBatch() that permits arbitrary command execution on the host.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.