---
id: CVE-2026-32141
title: flatted is a circular JSON parser
summary: >-
  flatted is a circular JSON parser. Prior to 3.4.0, flatted's parse() function
  uses a recursive revive() phase to resolve circular references in deserialized
  JSON. When given a crafted payload with deeply nested or self-referential $
  indi…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-674
  - CWE-770
vendor: webreflection
product: flatted
affected:
  - flatted < 3.4.0
patched:
  - flatted 3.4.0
published: '2026-03-12'
updated: '2026-07-02'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-32141'
references:
  - url: >-
      https://github.com/WebReflection/flatted/commit/7eb65d857e1a40de11c47461cdbc8541449f0606
    label: security-advisories@github.com
  - url: 'https://github.com/WebReflection/flatted/pull/88'
    label: security-advisories@github.com
  - url: >-
      https://github.com/WebReflection/flatted/security/advisories/GHSA-25h7-pfq9-p65f
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:13826'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:21772'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:34342'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:5807'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:9742'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-32141'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2447083'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://github.com/WebReflection/flatted/security/advisories/GHSA-25h7-pfq9-p65f
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32141.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00807
epssPercentile: 0.55345
ingestedAt: '2026-07-02T12:34:40.364Z'
---

## Overview

flatted is a circular JSON parser. Prior to 3.4.0, flatted's parse() function uses a recursive revive() phase to resolve circular references in deserialized JSON. When given a crafted payload with deeply nested or self-referential $ indices, the recursion depth is unbounded, causing a stack overflow that crashes the Node.js process. This vulnerability is fixed in 3.4.0.

## Affected

- `flatted < 3.4.0`

## Remediation

Upgrade past the affected range:

- `flatted 3.4.0`