## stream-json: FlexAssembler string/RegExp path filters join the full key stack per container start, giving O(depth^2) CPU denial of service

- 種別: advisory
- 重大度: medium
- 関連技術: nodejs
- CVE: CVE-2026-114129
- 公開日時: 2026-10-22T15:49:54.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-jj87-hc4r-jwfw)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-jj87-hc4r-jwfw

影響: npm:stream-json >= 2.0.0, <= 3.6.0 → 3.7.0
FlexAssembler, the custom-container assembler shipped in the stream-json package (src/core/utils/flex-assembler.js, re-exported at stream-json/utils/flex-assembler.js and stream-json/web/utils/flex-assembler.js), compiles a string or RegExp path filter into a matcher that runs keyStack.join(separator) on every container start. Because the key stack grows one entry per open object or array with no depth bound, a JSON document nested to depth D drives D container-start tokens that each perform an…