{"id":"CVE-2026-123568","title":"Sveltejs devalue before 5.6.3 Prototype Pollution via uneval Output","summary":"Sveltejs devalue before 5.6.3 contains a prototype pollution vulnerability that allows attackers to alter object prototypes by supplying untrusted data to uneval. When the generated code is later evaluated, it creates objects with pollut…","severity":"medium","cvss":4.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-1321"],"vendor":"sveltejs","product":"devalue","affected":["devalue < 5.6.3"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:38:06.526Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123568","references":[{"url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-8qm3-746x-r74r","label":"GitHub Security Advisory (GHSA-8qm3-746x-r74r)"},{"url":"https://www.vulncheck.com/advisories/sveltejs-devalue-before-5.6.3-prototype-pollution-via-uneval-output","label":"VulnCheck Advisory: Sveltejs devalue before 5.6.3 Prototype Pollution via uneval Output"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.659Z","slug":"CVE-2026-123568","body":"## Overview\n\nSveltejs devalue before 5.6.3 contains a prototype pollution vulnerability that allows attackers to alter object prototypes by supplying untrusted data to uneval. When the generated code is later evaluated, it creates objects with polluted prototypes, producing output data whose shape differs from the original input.\n\n## Affected\n\n- `devalue < 5.6.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}