CVE-2026-30226 — devalue has prototype pollution in devalue.parse and devalue.unflatten

CVE-2026-30226

devalue has prototype pollution in devalue.parse and devalue.unflatten PUBLISHED

Description (CNA)

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. In devalue v5.6.3 and earlier, devalue.parse and devalue.unflatten were susceptible to prototype pollution via maliciously crafted payloads. Successful exploitation could lead to Denial of Service (DoS) or type confusion. This vulnerability is fixed in 5.6.4.

Affected (CNA)

Vendor / product	Versions
sveltejs / devalue	affected < 5.6.4

CWE

CWE-1321

References

https://github.com/sveltejs/devalue/security/advisories/GHSA-cfw5-2vxh-hr84

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.