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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 3
https://github.com/WebReflection/flatted/commit/7eb65d857e1a40de11c47461cdbc854…
security-advisories@github.com
https://github.com/WebReflection/flatted/pull/88
security-advisories@github.com
https://github.com/WebReflection/flatted/security/advisories/GHSA-25h7-pfq9-p65f
security-advisories@github.com