Prototype Pollution in vm2 sandbox bridge
CVE-2026-44005 is a critical sandbox-isolation flaw in vm2, the Node.js vm/sandbox library. Affected versions 3.9.6 through 3.10.5 expose mutable proxies to real host-realm intrinsic prototypes through vm2's bridge layer. Sandbox-originated writes are then forwarded into the underlying host objects via otherReflectSet() and otherReflectDefineProperty(). As a result, attacker-controlled JavaScript executing inside a default VM or inherited NodeVM can mutate shared host prototypes, including Object.prototype, Array.prototype, and Function.prototype, from within the sandbox. This breaks the intended isolation boundary and enables prototype pollution of host-side intrinsics shared by the Node.js process. The issue is fixed in vm2 3.11.0.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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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 vm2 sandbox escape / prototype mutation vulnerability in vm2 for Node.js affecting versions 3.9.6 through 3.10.5, allowing attacker-controlled JavaScript in the sandbox to mutate shared host prototypes and impact integrity and availability.
A critical vm2 vulnerability enabling prototype pollution of shared host prototypes, potentially affecting the entire Node.js process.
A critical vm2 sandbox escape vulnerability that also enables prototype pollution via attacker-controlled JavaScript.
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.