Bug 2488387 (CVE-2026-47139)

Summary: CVE-2026-47139 vm2: vm2: Sandbox escape via internal HTTP built-ins leading to network restriction bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abarbaro, alizardo, dschmidt, erezende, jchui, jhe, jlanda, kshier, ktsao, nboldt, oaljalju, psrna, simaishi, smcdonal, stcannon, teagle, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in vm2, a Node.js sandbox. This vulnerability allows sandboxed code to bypass network restrictions by utilizing internal HTTP built-ins, such as _http_client and _http_server. An attacker can exploit this to make outbound HTTP requests or open listening HTTP sockets, even when public network modules are explicitly denied. This could lead to unauthorized information disclosure or further compromise of the system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-06-12 15:01:54 UTC
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.