Improper Validation of Specified Type of Input Affecting devalue package, versions <5.6.4
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Test your applications- Snyk IDSNYK-JS-DEVALUE-15479704
- published12 Mar 2026
- disclosed12 Mar 2026
- creditUnknown
Introduced: 12 Mar 2026
New CVE NOT AVAILABLE CWE-1287 (opens in a new tab)How to fix?
Upgrade devalue to version 5.6.4 or higher.
Overview
devalue is a JSON.stringify, but handles cyclical references, repeated references, undefined, regular expressions, dates, Map and Set.
Affected versions of this package are vulnerable to Improper Validation of Specified Type of Input in the hydrate() function that can accept __proto__ keys emitted from devalue.parse() or devalue.unflatten() functions. An attacker can manipulate object properties by supplying input that creates objects with a __proto__ own property, which may lead to prototype pollution in downstream code when such objects are merged or assigned.