{"affected":[{"defaultStatus":"unaffected","ecosystem":"npm","packageName":"devalue","product":"devalue","source":"CNA: VulnCheck","vendor":"sveltejs","versions":[{"lessThan":"5.9.3","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"5.9.3","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"npm","packageName":"devalue","product":"devalue","source":"OSV GHSA-mcm9-63f2-9j32","vendor":"","versions":[{"events":[{"introduced":"0"},{"fixed":"5.9.3"}],"lessThan":"5.9.3","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-123565","cwes":["CWE-400"],"description":"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.","epss":{"date":"2026-11-10","percentile":0.28133,"score":0.00343},"exploits":[],"kev":null,"metrics":[{"score":8.7,"severity":"high","source":"CNA: VulnCheck","vector":"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","version":"4.0"},{"score":7.5,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},{"score":8.7,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":7.5,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794333508362,"publishedAt":1794101884469,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-mcm9-63f2-9j32"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/devalue-before-5.9.3-quadratic-expansion-denial-of-service-via-uneval"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-mcm9-63f2-9j32"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/devalue-before-5.9.3-quadratic-expansion-denial-of-service-via-uneval"},{"source":"OSV / GitHub Security Advisories","tags":["advisory"],"url":"https://github.com/advisories/GHSA-mcm9-63f2-9j32"},{"source":"OSV / GitHub Security Advisories","tags":["osv"],"url":"https://osv.dev/vulnerability/GHSA-mcm9-63f2-9j32"}],"remediation":[{"kind":"fix","source":"OSV GHSA-mcm9-63f2-9j32","text":"devalue (npm): OSV reports a fixed version 5.9.3. Check the advisory for supported release branches.","url":"https://github.com/advisories/GHSA-mcm9-63f2-9j32"}],"revision":"33bc935c0db8b1871e7e1aba7c97faa1c8435ff58514dd739a6cdbbb5ef9b1a1","sources":[{"modifiedAt":1794333508362,"name":"CNA: VulnCheck","retrievedAt":1794334216777,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123565"},{"modifiedAt":1794104209040,"name":"NVD","retrievedAt":1794118575711,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123565"},{"modifiedAt":1794135373292,"name":"OSV / GitHub Security Advisories","retrievedAt":1794334218017,"url":"https://osv.dev/vulnerability/GHSA-mcm9-63f2-9j32"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794334234373,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-123565"}],"ssvc":{"assessedAt":1794328159440,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Devalue before 5.9.3 Quadratic Expansion Denial of Service via uneval","updatedAt":1794334234373}