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    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-123565",
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "state": "PUBLISHED",
        "assignerShortName": "VulnCheck",
        "dateReserved": "2026-11-06T00:53:14.312Z",
        "datePublished": "2026-11-08T01:38:04.469Z",
        "dateUpdated": "2026-11-08T01:38:04.469Z"
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                "dateUpdated": "2026-11-08T01:38:04.469Z"
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            "datePublic": "2026-09-18T00:00:00.000Z",
            "title": "Devalue before 5.9.3 Quadratic Expansion Denial of Service via uneval",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to uneval, producing a very large serialized string that exhausts memory or CPU."
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Uncontrolled Resource Consumption",
                            "cweId": "CWE-400",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "sveltejs",
                    "product": "devalue",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:npm/devalue",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "5.9.3"
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                            "version": "5.9.3",
                            "status": "unaffected",
                            "versionType": "semver"
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                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "attackVector": "NETWORK",
                        "baseScore": 8.7,
                        "baseSeverity": "HIGH",
                        "exploitMaturity": "NOT_DEFINED",
                        "privilegesRequired": "NONE",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
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                        "vulnIntegrityImpact": "NONE",
                        "vulnerabilityResponseEffort": "NOT_DEFINED"
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                        "confidentialityImpact": "NONE",
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                        "userInteraction": "NONE",
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            "references": [
                {
                    "url": "https://github.com/sveltejs/devalue/security/advisories/GHSA-mcm9-63f2-9j32",
                    "tags": [
                        "vendor-advisory"
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                    "name": "GitHub Security Advisory (GHSA-mcm9-63f2-9j32)"
                },
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                    "name": "VulnCheck Advisory: Devalue before 5.9.3 Quadratic Expansion Denial of Service via uneval",
                    "tags": [
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                }
            ],
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                {
                    "lang": "en",
                    "value": "elliott-with-the-longest-name-on-github",
                    "type": "remediation developer"
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                "engine": "vulncheck-endgame"
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}