Access of Resource Using Incompatible Type ('Type Confusion') Affecting devalue package, versions <5.9.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JS-DEVALUE-21185749
- published18 Oct 2026
- disclosed1 Oct 2026
- creditUnknown
Introduced: 1 Oct 2026
CVE-2026-123563 (opens in a new tab)How to fix?
Upgrade devalue to version 5.9.3 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 Access of Resource Using Incompatible Type ('Type Confusion') via the fromViewInfo parse operation in src/operations.js, where a custom reviver can replace an ArrayBuffer backing buffer with a number or array-like value. When a typed array constructor receives such a value, it allocates storage unrelated to the size of the serialized input, allowing an attacker to trigger unbounded memory allocation and crash the process.