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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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:eeddb977c54ae35323f05721269af55e89f7c866487300dbfde7e8f49d3b6ab9
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"devalue","vendor":"sveltejs","versions":[{"status":"affected","version":"< 5.6.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c1c94923157fe88931171f1683b755a3e7dc8b9c2ba3d341735f0b6662b1d9ae · sha256:9753cbaec23922fb… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c1c94923157fe88931171f1683b755a3e7dc8b9c2ba3d341735f0b6662b1d9ae · sha256:9753cbaec23922fb… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c1c94923157fe88931171f1683b755a3e7dc8b9c2ba3d341735f0b6662b1d9ae · sha256:9753cbaec23922fb… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/sveltejs/devalue/security/advisories/GHSA-cfw5-2vxh-hr84","tags":["x_refsource_CONFIRM"],"url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-cfw5-2vxh-hr84"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c1c94923157fe88931171f1683b755a3e7dc8b9c2ba3d341735f0b6662b1d9ae · sha256:9753cbaec23922fb… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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