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.
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Workaround
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References
History
Wed, 11 Mar 2026 18:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | devalue has prototype pollution in devalue.parse and devalue.unflatten | |
| Weaknesses | CWE-1321 | |
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| Metrics |
cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-03-11T17:47:40.016Z
Reserved: 2026-03-04T17:23:59.797Z
Link: CVE-2026-30226
Vulnrichment
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NVD
Status : Received
Published: 2026-03-11T18:16:22.937
Modified: 2026-03-11T18:16:22.937
Link: CVE-2026-30226
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Weaknesses