flatted is a circular JSON parser. Prior to version 3.4.2, the parse() function in flatted can use attacker-controlled string values from the parsed JSON as direct array index keys, without validating that they are numeric. Since the intern…
Exact source revision recorded 25 Oct 2026 08:17:18 UTC. It does not establish the source's current position. Latest evidence.
nvd · CVE-2026-33228
PublishedNVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.
Source analysis status: Modified
Weakness classifications: CWE-1321 · CWE-915
Original publisher date fields
published: 2026-03-20T23:16:46.510
lastModified: 2026-09-04T13:18:55.120
1 source CPE criteria · context only
- cpe:2.3:a:webreflection:flatted:*:*:*:*:*:node.js:*:*
The original JSON retains the logical configuration operators, exclusions and version bounds.
No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.
Original source record · Cite this exact observation · Complete original publisher JSON