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Vulnerability Details CVE-2026-30226

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 17.4%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-30226
  • Svelte » Devalue » Version: 1.0.0
    cpe:2.3:a:svelte:devalue:1.0.0
  • Svelte » Devalue » Version: 1.0.1
    cpe:2.3:a:svelte:devalue:1.0.1
  • Svelte » Devalue » Version: 1.0.2
    cpe:2.3:a:svelte:devalue:1.0.2
  • Svelte » Devalue » Version: 1.0.3
    cpe:2.3:a:svelte:devalue:1.0.3
  • Svelte » Devalue » Version: 1.0.4
    cpe:2.3:a:svelte:devalue:1.0.4
  • Svelte » Devalue » Version: 1.1.0
    cpe:2.3:a:svelte:devalue:1.1.0
  • Svelte » Devalue » Version: 1.1.1
    cpe:2.3:a:svelte:devalue:1.1.1
  • Svelte » Devalue » Version: 2.0.0
    cpe:2.3:a:svelte:devalue:2.0.0
  • Svelte » Devalue » Version: 2.0.1
    cpe:2.3:a:svelte:devalue:2.0.1
  • Svelte » Devalue » Version: 3.0.1
    cpe:2.3:a:svelte:devalue:3.0.1
  • Svelte » Devalue » Version: 3.1.0
    cpe:2.3:a:svelte:devalue:3.1.0
  • Svelte » Devalue » Version: 3.1.1
    cpe:2.3:a:svelte:devalue:3.1.1
  • Svelte » Devalue » Version: 3.1.2
    cpe:2.3:a:svelte:devalue:3.1.2
  • Svelte » Devalue » Version: 3.1.3
    cpe:2.3:a:svelte:devalue:3.1.3
  • Svelte » Devalue » Version: 4.0.0
    cpe:2.3:a:svelte:devalue:4.0.0
  • Svelte » Devalue » Version: 4.0.1
    cpe:2.3:a:svelte:devalue:4.0.1
  • Svelte » Devalue » Version: 4.1.0
    cpe:2.3:a:svelte:devalue:4.1.0
  • Svelte » Devalue » Version: 4.2.0
    cpe:2.3:a:svelte:devalue:4.2.0
  • Svelte » Devalue » Version: 4.2.1
    cpe:2.3:a:svelte:devalue:4.2.1
  • Svelte » Devalue » Version: 4.2.2
    cpe:2.3:a:svelte:devalue:4.2.2
  • Svelte » Devalue » Version: 4.2.3
    cpe:2.3:a:svelte:devalue:4.2.3
  • Svelte » Devalue » Version: 4.3.0
    cpe:2.3:a:svelte:devalue:4.3.0
  • Svelte » Devalue » Version: 4.3.1
    cpe:2.3:a:svelte:devalue:4.3.1
  • Svelte » Devalue » Version: 4.3.2
    cpe:2.3:a:svelte:devalue:4.3.2
  • Svelte » Devalue » Version: 4.3.3
    cpe:2.3:a:svelte:devalue:4.3.3
  • Svelte » Devalue » Version: 5.0.0
    cpe:2.3:a:svelte:devalue:5.0.0
  • Svelte » Devalue » Version: 5.1.0
    cpe:2.3:a:svelte:devalue:5.1.0
  • Svelte » Devalue » Version: 5.1.1
    cpe:2.3:a:svelte:devalue:5.1.1
  • Svelte » Devalue » Version: 5.3.0
    cpe:2.3:a:svelte:devalue:5.3.0
  • Svelte » Devalue » Version: 5.3.1
    cpe:2.3:a:svelte:devalue:5.3.1
  • Svelte » Devalue » Version: 5.3.2
    cpe:2.3:a:svelte:devalue:5.3.2
  • Svelte » Devalue » Version: 5.4.0
    cpe:2.3:a:svelte:devalue:5.4.0
  • Svelte » Devalue » Version: 5.4.1
    cpe:2.3:a:svelte:devalue:5.4.1
  • Svelte » Devalue » Version: 5.4.2
    cpe:2.3:a:svelte:devalue:5.4.2
  • Svelte » Devalue » Version: 5.5.0
    cpe:2.3:a:svelte:devalue:5.5.0
  • Svelte » Devalue » Version: 5.6.0
    cpe:2.3:a:svelte:devalue:5.6.0
  • Svelte » Devalue » Version: 5.6.1
    cpe:2.3:a:svelte:devalue:5.6.1
  • Svelte » Devalue » Version: 5.6.2
    cpe:2.3:a:svelte:devalue:5.6.2


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