{"id":"CVE-2026-42567","state":"PUBLISHED","title":"Svelte: ReDoS in `<svelte:element>` Tag Validation","description":"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.","publishedAt":"2026-06-09T16:22:22.703Z","updatedAt":"2026-06-09T18:09:26.356Z","severity":{"score":5.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["sveltejs svelte"],"affected":[{"vendor":"sveltejs","product":"svelte","versions":[{"version":">= 5.51.5, < 5.55.7","status":"affected"}]}],"references":["https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6","https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7"],"weaknesses":["CWE-1333"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/42xxx/CVE-2026-42567.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42567","state":"PUBLISHED","datePublished":"2026-06-09T16:22:22.703Z","dateUpdated":"2026-06-09T18:09:26.356Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-28T17:26:12.084Z"},"containers":{"cna":{"title":"Svelte: ReDoS in `<svelte:element>` Tag Validation","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"sveltejs","product":"svelte","versions":[{"version":">= 5.51.5, < 5.55.7","status":"affected"}]}],"references":[{"url":"https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6","name":"https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7","name":"https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-09T16:22:22.703Z"},"source":{"advisory":"GHSA-9rmh-mm8f-r9h6","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-09T18:09:08.059769Z","id":"CVE-2026-42567","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-09T18:09:26.356Z"}}]}}}