CVE-2026-71429

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CVE-2026-71429

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

Details: 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. The streamArray, streamObject, and streamValues streamers are not affected because they use the constant-time asm.depth getter. This issue is fixed in version 3.5.0.

References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71429.json, https://github.com/uhop/stream-json/security/advisories/GHSA-528h-pc64-c93x, https://nvd.nist.gov/vuln/detail/CVE-2026-71429, https://github.com/uhop/stream-json/commit/a869fb98aaef9225556f49901a8f55954ff856e6