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CVE-2026-123561 Details

Description

devalue before 5.9.3 allows malformed null-prototype object keys to bypass parse's __proto__ rejection through property-key coercion, an incomplete fix for GHSA-mwv9-gp5h-frr4. Attackers can supply crafted payloads that yield objects with a __proto__ own property, which alone does not cause prototype pollution.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:3.7 LOWVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/sveltejs/devalue/security/advisories/GHSA-4q55-j62x-fr9h	[email protected]
https://www.vulncheck.com/advisories/sveltejs-devalue-before-5.9.3-proto-rejection-bypass-via-property-key-coercion	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1321	Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

1 change record found show changes