{"id":"CVE-2026-71429","aliases":["GHSA-528h-pc64-c93x"],"url":"https://o3.security/vulnerability/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.","published":"2026-09-03T20:15:19.721Z","modified":"2026-09-06T03:30:55.437004725Z","cvss":{"score":6.2,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"stream-json","fixedVersion":"3.5.0"}],"fix":{"url":"https://github.com/uhop/stream-json/commit/a869fb98aaef9225556f49901a8f55954ff856e6","label":"uhop/stream-json@a869fb9"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71429.json"},{"type":"ADVISORY","url":"https://github.com/uhop/stream-json/security/advisories/GHSA-528h-pc64-c93x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71429"},{"type":"FIX","url":"https://github.com/uhop/stream-json/commit/a869fb98aaef9225556f49901a8f55954ff856e6"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-06T03:30:55.437004725Z"}}