Moderate severityNVD Advisory· Published Mar 11, 2026· Updated Mar 12, 2026
devalue has prototype pollution in devalue.parse and devalue.unflatten
CVE-2026-30226
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
devaluenpm | < 5.6.4 | 5.6.4 |
Affected products
2Patches
Vulnerability mechanics
References
3- github.com/advisories/GHSA-cfw5-2vxh-hr84ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-30226ghsaADVISORY
- github.com/sveltejs/devalue/security/advisories/GHSA-cfw5-2vxh-hr84ghsax_refsource_CONFIRMWEB
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