---
id: CVE-2026-22775
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 5.1.0 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 >= 5.1.0, < 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-2026-22775'
references:
  - url: >-
      https://github.com/sveltejs/devalue/commit/11755849fa0634ae294a15ec0aef2f43efcad7c4
    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-g2pg-6438-jwpf
    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-2026-22775'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2430109'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22775.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00635
epssPercentile: 0.48136
ingestedAt: '2026-06-30T13:26:50.498Z'
---

## Overview

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.1.0 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 ArrayBuffer hydration expecting base64 encoded strings as input, but not checking the assumption before decoding the input. This vulnerability is fixed in 5.6.2.

## Affected

- `devalue >= 5.1.0, < 5.6.2`

## Remediation

Upgrade past the affected range:

- `devalue 5.6.2`