Bug 2536025 (CVE-2026-92957) - CVE-2026-92957 vm2: vm2 before 3.11.7 Authentication Bypass via node: Prefix
Summary: CVE-2026-92957 vm2: vm2 before 3.11.7 Authentication Bypass via node: Prefix
Keywords:
Status: NEW
Alias: CVE-2026-92957
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-17 13:56 UTC by OSIDB Bzimport
Modified: 2026-09-30 10:16 UTC (History)
16 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-17 13:56:19 UTC
vm2 through 3.11.6 does not normalize `node:`-prefixed builtin specifiers when evaluating user-supplied negative (deny) entries in a NodeVM wildcard require policy. Although NodeVM strips the `node:` prefix during require() resolution, negative wildcard entries are matched by exact string comparison against the canonical builtin names, so a policy such as `new NodeVM({ require: { builtin: ['*', '-node:child_process'] } })` fails to deny the canonical `child_process` module. Sandboxed code can therefore obtain the host `child_process` builtin via `require('child_process')` or `require('node:child_process')`, gaining references to process-spawning APIs such as execSync and spawn, which is equivalent to host command-execution capability for untrusted sandbox code. Fixed in vm2 3.11.7. (Suggested title: "vm2 before 3.11.7: NodeVM builtin deny-list bypass via node:-prefixed specifiers exposes child_process")


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