Vulnerability Description
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 internal input buffer is a JavaScript Array, accessing it with the key "__proto__" returns Array.prototype via the inherited getter. This object is then treated as a legitimate parsed value and assigned as a property of the output object, effectively leaking a live reference to Array.prototype to the consumer. Any code that subsequently writes to that property will pollute the global prototype. This issue has been patched in version 3.4.2.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Webreflection | Flatted | < 3.4.2 |
Related Weaknesses (CWE)
References
- https://github.com/WebReflection/flatted/commit/885ddcc33cf9657caf38c57c7be45ae1Patch
- https://github.com/WebReflection/flatted/releases/tag/v3.4.2Product
- https://github.com/WebReflection/flatted/security/advisories/GHSA-rf6f-7fwh-wjghExploitVendor Advisory
FAQ
What is CVE-2026-33228?
CVE-2026-33228 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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...
How severe is CVE-2026-33228?
CVE-2026-33228 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-33228?
Check the references section above for vendor advisories and patch information. Affected products include: Webreflection Flatted.