CVE-2026-47139
vm2: NodeVM network builtin exclusions bypass via internal _http_client and _http_server
Reported by github_m · Published June 12, 2026
vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, NodeVM supports excluding public network builtins from the wildcard builtin option. With this configuration direct access to http, https, http2, net, dgram, tls, dns, and dns/promises is blocked. However, Node.js also exposes underscored internal HTTP builtins such as _http_client and _http_server. These are not blocked when the public modules are excluded. Sandboxed code can use these internal builtins to make outbound HTTP requests and open listening HTTP sockets even though the public network modules are denied. This issue has been patched in version 3.11.4.
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| patriksimek | vm2 | < 3.11.4 |
| patriksimek | vm2 | 0 |
| npm | vm2 | 0 |
Timeline
- May 18, 2026 CVE Published
- Jun 1, 2026 Security Advisory (3 in total, the first dated here)
- Jun 12, 2026 CVE Updated
- Aug 7, 2026 EPSS Score (25 in total, the first dated here)
- Aug 11, 2026 Distribution Patch (2 in total, the first dated here)
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References
- https://github.com/patriksimek/vm2/security/advisories/GHSA-r9pm-gxmw-wv6p x_refsource_CONFIRM
- https://github.com/patriksimek/vm2/commit/436053e30eecbabd487e2fd2959c137ac34e2bb1 x_refsource_MISC
- https://github.com/patriksimek/vm2/releases/tag/v3.11.4 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-47139 advisory
- https://github.com/advisories/GHSA-r9pm-gxmw-wv6p advisory