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flatted (npm)

A fast and minimal circular JSON parser.

Advisories
4
Latest version
3.4.4
Released Jul 30, 2026
License
ISC
OpenSSF Scorecard
4.3 / 10

How to fix

Upgrading to 3.4.2 or later clears every advisory below that has a fix.

Upgrade commands
npm
npm install flatted@3.4.4
yarn
yarn add flatted@3.4.4
pnpm
pnpm add flatted@3.4.4

Known vulnerabilities

AdvisorySeverityAffectedFixed in
GHSA-rf6f-7fwh-wjgh
Prototype Pollution via parse() in NodeJS flatted
 High
EPSS 0.84%
< 3.4.2
3.4.2
GHSA-rf6f-7fwh-wjgh
Prototype Pollution via parse() in NodeJS flatted
 High
EPSS 0.84%
<= 3.4.1
No fix yet
GHSA-25h7-pfq9-p65f
flatted vulnerable to unbounded recursion DoS in parse() revive phase
 High
EPSS 0.84%
< 3.4.0
3.4.0
GHSA-25h7-pfq9-p65f
flatted vulnerable to unbounded recursion DoS in parse() revive phase
 High
EPSS 0.84%
< 3.4.0
3.4.0

Source: git+https://github.com/WebReflection/flatted.git

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