7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-22774

CVE-2026-22774: devalue vulnerable to denial of service due to memory exhaustion in devalue.parse

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.3.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the typed array hydration expecting an ArrayBuffer as input, but not checking the assumption before creating the typed array. This vulnerability is fixed in 5.6.2.

(GitHub Advisory)

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CVE-2026-22774

CVE-2026-22774:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
devalue	npm	>= 5.3.0, <= 5.6.1	5.6.2

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability, identified as GHSA-vw5p-8cq8-m7mv, is a denial-of-service weakness in the devalue library. The root cause is improper input validation within the unflatten function, which is internally called by the exported parse function. The patch analysis reveals that the logic for hydrating TypedArray objects was flawed. It did not verify that the input data it was processing was a valid ArrayBuffer. This oversight allows an attacker to craft a malicious JSON string where a TypedArray references itself or another object in a circular manner. When devalue.parse processes this string, the internal hydrate function within unflatten enters an infinite recursive loop while trying to resolve the circular dependency. This leads to uncontrolled resource consumption, exhausting CPU and memory, and ultimately causing the application to crash. The patch mitigates this by adding explicit checks to validate that the input for a TypedArray is indeed an ArrayBuffer and by adding checks to detect circular references, thus preventing the infinite recursion.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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