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CVE-2026-47135: Incomplete Symbol For Namespace Blockcve-2026-47135-incomplete-symbol-for-namespace-block

Overriding `Symbol.for` with exact string matches (e.g., `=== 'nodejs.util.inspect.custom'`) against Node.js internal cross-realm symbols is an incomplete mitigation. Unhandled `nodejs.` symbols (such as streams or promisify hooks) can bypass the sandbox. Instead, block or isolate the entire `nodejs.` namespace using a prefix match.

JSCVE-2026-47135CWE-184CWE-693
by Provallyupdated 2026-06-12Apache-2.0
4960 direct496 via packs
72
CVE-2026-47135: Vm2 Incomplete Symbol Blocklistcve-2026-47135-vm2-incomplete-symbol-blocklist

A sandbox limits access to some `nodejs.` internal symbols but uses an incomplete string blocklist. Attackers can bypass this by requesting unblocked internal symbols like `nodejs.util.promisify.custom` or stream symbols.

JSCVE-2026-47135
by Provallyupdated 2026-06-23Apache-2.0
8600 direct860 via packs
70
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