{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:svelte:svelte:*:*:*:*:*:node.js:*:*",
            "extracted_events": [
              {
                "introduced": "5.51.5"
              },
              {
                "fixed": "5.55.7"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "8ea33bf7fe86d0d53cbe4104419cda9b4bb0442f"
            },
            {
              "fixed": "4d8f99a2709e3c02e48d8bc6c77458f4ba49d0e3"
            }
          ],
          "repo": "https://github.com/sveltejs/svelte",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9rmh-mm8f-r9h6"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1333"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42567.json"
  },
  "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 \u003csvelte:element this={tag}\u003e\u003c/svelte:element\u003e. This issue has been patched in version 5.55.7.",
  "id": "CVE-2026-42567",
  "modified": "2026-07-08T05:36:51.625688097Z",
  "published": "2026-06-09T16:22:22.703Z",
  "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"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Svelte: ReDoS in `\u003csvelte:element\u003e` Tag Validation"
}