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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-9rgm-9g3h-6x36 Svelte devalue: DoS via malformed input
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 17 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 17 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1285
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 16 Sep 2026 18:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Svelte devalue: DoS via malformed input
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-17T19:25:51.846Z

Reserved: 2026-08-26T16:26:08.967Z

Link: CVE-2026-81176

cve-icon Vulnrichment

Updated: 2026-09-17T17:06:25.819Z

cve-icon NVD

Status : Received

Published: 2026-09-16T19:17:43.437

Modified: 2026-09-17T20:18:36.613

Link: CVE-2026-81176

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-16T18:34:34Z

Links: CVE-2026-81176 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses