CVE-2026-123563

CVSS 8.7 (high) · published 2026-11-08

Devalue before 5.9.3 contains a validation bypass vulnerability that allows custom ArrayBuffer revivers to skip typed-array allocation checks in the parse function. Attackers can supply very small crafted input processed by a malformed ArrayBuffer reviver to allocate massive ArrayBuffers, causing memory exhaustion and denial of service.

Weakness: CWE-789

Source: NVD CVE-2026-123563

References

• https://github.com/sveltejs/devalue/security/advisories/GHSA-r9w8-h9r3-54w4
• https://www.vulncheck.com/advisories/devalue-before-5.9.3-typed-array-allocation-validation-bypass-via-parse

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