---
id: CVE-2026-81176
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. Prior to 5.9.2,
  devalue.parse does not reject out-of-bounds indices that are greater than or
  equal to values.len…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-770
  - CWE-1285
vendor: sveltejs
product: devalue
affected:
  - devalue < 5.9.2
published: '2026-09-16'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T20:18:36.613'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81176'
references:
  - url: >-
      https://github.com/sveltejs/devalue/commit/8b2a4562c446d7c36d9d629778079a5fae4243e1
    label: security-advisories@github.com
  - url: 'https://github.com/sveltejs/devalue/releases/tag/v5.9.2'
    label: security-advisories@github.com
  - url: >-
      https://github.com/sveltejs/devalue/security/advisories/GHSA-9rgm-9g3h-6x36
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81176.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-81176'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2535592'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-81176'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81176'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-17T17:06:24.802418Z'
ingestedAt: '2026-09-16T19:02:30.733Z'
epss: 0.00507
epssPercentile: 0.40705
---

## Overview

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. Prior to 5.9.2, devalue.parse does not reject out-of-bounds indices that are greater than or equal to values.length in src/parse.js. A specially crafted untrusted payload can make the parser alternate between array representations, producing quadratic work as the payload grows and causing denial of service in applications that parse untrusted devalue data. This issue is fixed in version 5.9.2.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Build of Podman Desktop, Red Hat OpenShift AI (RHOAI), Red Hat Trusted Artifact Signer · no fix planned: Red Hat Build of Podman Desktop, Red Hat OpenShift AI (RHOAI), Red Hat Trusted Artifact Signer · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81176.json)