{"id":"CVE-2026-42567","aliases":["GHSA-9rmh-mm8f-r9h6"],"url":"https://o3.security/vulnerability/CVE-2026-42567","summary":"Svelte: ReDoS in `<svelte:element>` Tag Validation","details":"Svelte is a performance oriented web framework. From version 5.51.5 to before version 5.55.7, an internal regex in the Svelte runtime can take exponential time to test in <svelte:element this={tag}></svelte:element>. This issue has been patched in version 5.55.7.","published":"2026-06-09T16:22:22.703Z","modified":"2026-08-05T03:32:16.595786277Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"svelte","fixedVersion":"5.55.7"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42567.json"},{"type":"ADVISORY","url":"https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42567"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:32:16.595786277Z"}}