{"id":"CVE-2026-123487","published":"2026-11-06T15:17:17.947","lastModified":"2026-11-06T18:18:03.383","description":"Parse Server before 8.6.115 and 9.0.0 before 9.10.7-alpha.1 validates user email address format with a regular expression whose run time grows quadratically with input length and that is applied without a length limit. An unauthenticated attacker who knows the application ID can send a sign-up request, or a logged-in user can update their own email, with a long crafted email address to block the Node.js event loop and deny service to all clients.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-1333"],"vendors":[],"products":[],"references":[{"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-9492-427f-466x","tags":[]},{"url":"https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.7-alpha.1-redos-via-email-validation-regex","tags":[]}],"exploitRefs":[{"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-9492-427f-466x","tags":[]}],"hasPoc":true,"ai":null}