Sveltejs devalue from 1.0.0 before 5.9.3 contains a memory exhaustion flaw in uneval, whose generated code for sparse arrays allocates memory proportional to the array's declared length when evaluated. Attackers who can influence a very large sparse array serialized by an application can exhaust memory in the browser or runtime evaluating the output.
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Fixes

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Workaround

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History

Sun, 08 Nov 2026 01:45:00 +0000

Type Values Removed Values Added
Description Sveltejs devalue from 1.0.0 before 5.9.3 contains a memory exhaustion flaw in uneval, whose generated code for sparse arrays allocates memory proportional to the array's declared length when evaluated. Attackers who can influence a very large sparse array serialized by an application can exhaust memory in the browser or runtime evaluating the output.
Title Sveltejs devalue before 5.9.3 Memory Exhaustion via uneval Sparse Arrays
First Time appeared Svelte
Svelte devalue
Weaknesses CWE-770
CPEs cpe:2.3:a:svelte:devalue:*:*:*:*:*:*:*:*
Vendors & Products Svelte
Svelte devalue
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-08T01:38:03.802Z

Reserved: 2026-11-06T00:50:45.483Z

Link: CVE-2026-123564

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-08T02:16:48.877

Modified: 2026-11-08T02:16:48.877

Link: CVE-2026-123564

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-08T04:15:14Z

Weaknesses