CVE-2026-55091
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Detection and validation
Mapped metadata availability only. These signals do not change priority.
Sigma
Not mapped by tracked sources.
Atomic
Not mapped by tracked sources.
Nuclei
Not mapped by tracked sources.
What it is
Reportedflat-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.…
Source reported · Source: CVE record · Source last published: · Source description excerpt; complete tracked detail loads below. · Source last updated: · Tracker data as of:
What is affected
Reportedjoaonuno; flat-to-nested-js. Product-level identification only; no affected-version conclusion is available from this field.
Source reported · Source: CVE record · Source last published: · Source last updated: · Tracker data as of:
Urgency and basis
ReportedTrack · 116.8
Tracker computed · Tracker decision tier from the evidence detailed below · Source last updated: · Tracker data as of:
Exploitation evidence
Not reportedNot reported by tracked sources.
What to do
Not reportedNot reported by tracked sources.
Evidence detail
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