Detections
Analytics

SCA: security update for flat-to-nested (GHSA-hp36-v28f-w3r4)

high Tenable Cloud Security Plugin ID 443729

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-55091)

Solution

Update the flat-to-nested library and its related packages to version 1.1.2 or later.

See Also

https://github.com/advisories/GHSA-hp36-v28f-w3r4

Plugin Details

Severity: High

ID: 443729

Version: Revision 1.4

Type: Local

Family: SCA Checks

Published: 6/20/2026

Updated: 9/15/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

CVSS Score Source: CVE-2026-55091

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/19/2026

Vulnerability Publication Date: 6/19/2026

Reference Information

CVE: CVE-2026-55091