{"affected":[{"defaultStatus":"unaffected","ecosystem":"npm","packageName":"devalue","product":"devalue","source":"CNA: VulnCheck","vendor":"sveltejs","versions":[{"lessThan":"5.9.3","status":"affected","version":"1.0.0","versionType":"semver"},{"status":"unaffected","version":"5.9.3","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"npm","packageName":"devalue","product":"devalue","source":"OSV GHSA-wf3x-273g-mvxv","vendor":"","versions":[{"events":[{"introduced":"1.0.0"},{"fixed":"5.9.3"}],"lessThan":"5.9.3","status":"affected","version":"1.0.0","versionType":"semver"}]}],"cveId":"CVE-2026-123564","cwes":["CWE-770"],"description":"Sveltejs devalue from 1.0.0 before 5.9.3 contains a memory exhaustion flaw in uneval, whose generated code for sparse arrays allocates memory proportional to the array's declared length when evaluated. Attackers who can influence a very large sparse array serialized by an application can exhaust memory in the browser or runtime evaluating the output.","epss":{"date":"2026-11-10","percentile":0.28134,"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":1794488562004,"publishedAt":1794101883802,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-wf3x-273g-mvxv"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/sveltejs-devalue-before-5.9.3-memory-exhaustion-via-uneval-sparse-arrays"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-wf3x-273g-mvxv"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/sveltejs-devalue-before-5.9.3-memory-exhaustion-via-uneval-sparse-arrays"},{"source":"OSV / GitHub Security Advisories","tags":["advisory"],"url":"https://github.com/advisories/GHSA-wf3x-273g-mvxv"},{"source":"OSV / GitHub Security Advisories","tags":["osv"],"url":"https://osv.dev/vulnerability/GHSA-wf3x-273g-mvxv"}],"remediation":[{"kind":"fix","source":"OSV GHSA-wf3x-273g-mvxv","text":"devalue (npm): OSV reports a fixed version 5.9.3. Check the advisory for supported release branches.","url":"https://github.com/advisories/GHSA-wf3x-273g-mvxv"}],"revision":"547c504ed52dc8d389521110546ba8b3a3b935db4e412f23484e11887abe404e","sources":[{"modifiedAt":1794488562004,"name":"CNA: VulnCheck","retrievedAt":1794492540628,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123564"},{"modifiedAt":1794104208877,"name":"NVD","retrievedAt":1794118575563,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123564"},{"modifiedAt":1794135368686,"name":"OSV / GitHub Security Advisories","retrievedAt":1794492541075,"url":"https://osv.dev/vulnerability/GHSA-wf3x-273g-mvxv"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794377571378,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-123564"}],"ssvc":{"assessedAt":1794488524902,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Sveltejs devalue before 5.9.3 Memory Exhaustion via uneval Sparse Arrays","updatedAt":1794492541075}