Host data disclosure via observability builtins
Published Jun 12, 2026 · Updated Jun 12, 2026
Information disclosure in NodeVM before 3.11.4 allows attackers to read host-process data through permitted observability builtins. The lib/builtin.js dangerous-builtin denylist omits diagnostics_channel, async_hooks, perf_hooks, and v8, so readonly host modules expose process-wide state. Exploitation requires untrusted JavaScript to run in NodeVM with an affected builtin allowed and can reveal HTTP authorization or session headers, async request context, performance marks, or heap data from the shared host process.
Summary
What happened
Information disclosure in NodeVM before 3.11.4 allows attackers to read host-process data through permitted observability builtins. The lib/builtin.js dangerous-builtin denylist omits diagnostics_channel, async_hooks, perf_hooks, and v8, so readonly host modules expose process-wide state. Exploitation requires untrusted JavaScript to run in NodeVM with an affected builtin allowed and can reveal HTTP authorization or session headers, async request context, performance marks, or heap data from the shared host process.
The record
- CVE
- CVE-2026-47141
- Published
- Jun 12, 2026
- Updated
- Jun 12, 2026
- Vendor
- Patrik Simek
- Product
- vm2
- Classifications
- CWE-668, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 12, 2026CVE publishedPublication date reported by the CVE source.
- Jun 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3.11.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- observability-builtins-info-leak.jsproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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