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CVE-2026-43999 is a critical sandbox escape vulnerability in vm2, an open-source sandbox for Node.js. In vm2 versions prior to 3.11.0, NodeVM's builtin allowlist can be bypassed when the builtin module is permitted, including configurations that allow all builtins via the '*' wildcard. The root cause is that the exposed module builtin provides access to Node's Module._load(), which resolves and loads modules directly in the host context rather than enforcing vm2's builtin restriction logic. As a result, sandboxed code can import built-in modules that were intended to be blocked and break out of the intended isolation boundary. This can be used to reach sensitive host capabilities and escalate to arbitrary code execution on the host.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A separate vm2 vulnerability referenced for comparison as a direct arbitrary code execution issue.
A vm2 sandbox escape CVE mentioned only as part of a historical list.
A critical vm2 allowlist bypass leading to child_process RCE, mentioned as part of the 2026 vulnerability wave.
A prior vm2 sandbox escape vulnerability listed in the security history.
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.