{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-42570: Svelte devalue: DoS via sparse array deserialization","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-42570","status":"final","version":"1","initial_release_date":"2026-06-09T16:12:26.377Z","current_release_date":"2026-06-09T18:06:56.030Z","revision_history":[{"date":"2026-06-09T16:12:26.377Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-42570 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-42570"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-42570"},{"category":"external","summary":"https://github.com/sveltejs/devalue/security/advisories/GHSA-77vg-94rm-hx3p","url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-77vg-94rm-hx3p"},{"category":"external","summary":"https://github.com/sveltejs/devalue/commit/206ca6712fbc380a4571c59de9ab04b91110792d","url":"https://github.com/sveltejs/devalue/commit/206ca6712fbc380a4571c59de9ab04b91110792d"},{"category":"external","summary":"https://github.com/sveltejs/devalue/releases/tag/v5.8.1","url":"https://github.com/sveltejs/devalue/releases/tag/v5.8.1"}]},"product_tree":{"branches":[{"category":"vendor","name":"sveltejs","branches":[{"category":"product_name","name":"devalue","branches":[{"category":"product_version","name":">= 5.6.3, < 5.8.1","product":{"name":"sveltejs devalue >= 5.6.3, < 5.8.1","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:sveltejs:devalue:\\>\\=_5.6.3\\,_\\<_5.8.1:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-42570","title":"Svelte devalue: DoS via sparse array deserialization","notes":[{"category":"description","text":"Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}