CVE-2026-30226 — devalue has prototype pollution in devalue.parse and devalue.unflatten
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 dev…
Published: 2026-03-11 · CVSS: 6.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7