---
id: CVE-2026-22774
title: >-
  Svelte devalue is a JavaScript library that serializes values into strings
  when JSON.stringify isn't sufficient for the job
summary: >-
  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,
  potenti…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-405
  - CWE-405
vendor: svelte
product: devalue
affected:
  - 'devalue >= 5.3.0, < 5.6.2'
patched:
  - devalue 5.6.2
published: '2026-01-15'
updated: '2026-06-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-22774'
references:
  - url: >-
      https://github.com/sveltejs/devalue/commit/e46afa64dd2b25aa35fb905ba5d20cea63aabbf7
    label: security-advisories@github.com
  - url: 'https://github.com/sveltejs/devalue/releases/tag/v5.6.2'
    label: security-advisories@github.com
  - url: >-
      https://github.com/sveltejs/devalue/security/advisories/GHSA-vw5p-8cq8-m7mv
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:2144'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:2926'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-22774'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2430095'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22774.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00635
epssPercentile: 0.48136
ingestedAt: '2026-06-30T13:26:50.496Z'
---

## Overview

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.

## Affected

- `devalue >= 5.3.0, < 5.6.2`

## Remediation

Upgrade past the affected range:

- `devalue 5.6.2`