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2 vulnerabilities by WebReflection

CVE-2026-33228 (GCVE-0-2026-33228)

Vulnerability from cvelistv5 – Published: 2026-03-20 23:06 – Updated: 2026-03-24 17:57
VLAI?
Title
flatted: Prototype Pollution via parse()
Summary
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.
Severity ?
8.9 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
Impacted products
Vendor Product Version
WebReflection flatted Affected: < 3.4.2
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CVE-2026-32141 (GCVE-0-2026-32141)

Vulnerability from cvelistv5 – Published: 2026-03-12 18:08 – Updated: 2026-03-13 16:20
VLAI?
Title
flatted: Unbounded recursion DoS in parse() revive phase
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 $ indices, the recursion depth is unbounded, causing a stack overflow that crashes the Node.js process. This vulnerability is fixed in 3.4.0.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
WebReflection flatted Affected: < 3.4.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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