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CVE-2026-71429 - stream-json: pick/ignore/filter/replace filters are O(depth²) on nested input — small crafted JSON blocks the event loop for seconds→minutes (DoS)

CVE ID : CVE-2026-71429 Published : Sept. 3, 2026, 8:15 p. m. • 25 minutes ago Description : stream-json is a micro-library of stream components for processing JSON and JSONC with a minimal memory footprint. Prior to 3. 5. 0, the path filters pick, ignore, filter, and replace in src/core/filters/filter-base. js recompute the full path string from the nesting stack for every checkable token. Because the stack length equals the current nesting depth and a checkable token is emitted at every level, a depth D document costs O(D²) rather than O(D) to process. The issue is triggered by nesting depth rather than byte volume, including the documented pick({filter: 'data'}) traversal-until-match path, so an application that sends untrusted JSON through a string or RegExp filter can block the Node. js event loop and cause denial of service with a small deeply nested document.