6.3
Medium
CVE-2026-30226 Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for…
Description
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 products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| devalue 5.6 | earliest → < 5.6.4 | 5.6.4 |
Other CVEs of devalue
The 16 CVEs of devalue →
CVE-2026-123569
Devalue before 5.6.3 Denial of Service via Sparse Array Serialization
8.7
High
CVE-2026-123568
Sveltejs devalue before 5.6.3 Prototype Pollution via uneval Output
2.1
Low
CVE-2026-123566
Devalue before 5.9.3 CPU Amplification Denial of Service via uneval
8.7
High
CVE-2026-123567
Sveltejs devalue before 5.6.4 Prototype Injection via parse and unflatten
6.3
Medium