{"id":"CVE-2026-123565","title":"Devalue before 5.9.3 Quadratic Expansion Denial of Service via uneval","summary":"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 …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-400"],"vendor":"sveltejs","product":"devalue","affected":["devalue < 5.9.3"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:38:04.469Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123565","references":[{"url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-mcm9-63f2-9j32","label":"GitHub Security Advisory (GHSA-mcm9-63f2-9j32)"},{"url":"https://www.vulncheck.com/advisories/devalue-before-5.9.3-quadratic-expansion-denial-of-service-via-uneval","label":"VulnCheck Advisory: Devalue before 5.9.3 Quadratic Expansion Denial of Service via uneval"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.660Z","slug":"CVE-2026-123565","body":"## Overview\n\nSveltejs 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.\n\n## Affected\n\n- `devalue < 5.9.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}