CVE-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.
JSgreprules fetch cve-2026-47135-incomplete-symbol-for-namespace-block --engine opengrepDescription
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.
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