CVE-2026-55091

CVE-2026-55091 · flat-to-nested: Prototype pollution in flat-to-nested convert() via __proto__ parent/id key

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flat-to-nested converts a hierarchy from a flat representation to a nested representation. Prior to 1.1.2, FlatToNested.prototype.convert in index.js uses attacker-influenced id and parent record fields directly as keys in the plain temp and pendingChildOf objects. When parent or id is __proto__, temp[parent] can resolve to Object.prototype, and initPush() can write attacker-controlled data to the global children prototype property while existing prototype methods remain intact. Any application that passes attacker-influenced flat records to convert() can therefore expose unrelated objects to polluted inherited state, causing application-logic corruption or denial of service and potentially enabling greater impact when a downstream prototype-pollution gadget is present. The constructor and prototype strings are also unsafe inherited-key values in the same lookup design. This issue is fixed in version 1.1.2.

CVSS 7.5 · Hoch · EPSS 0,5% · Korrektur verfügbar

Veröffentlicht

2026-09-14T17:26:38.877Z

Aktualisiert

2026-09-14T20:05:59.070Z

Technologie-Stack: node

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