{"id":"CVE-2026-123487","title":"Parse Server 9.0.0 before 9.10.7-alpha.1 ReDoS via Email Validation Regex","summary":"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…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-1333"],"vendor":"parse-community","product":"parse-server","affected":["parse-server >= 9.0.0 < 9.10.7-alpha.1","parse-server < 8.6.115"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-11-06T17:11:55.570614Z"},"published":"2026-11-06","updated":"2026-11-06","sourceUpdated":"2026-11-06T17:14:55.801Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123487","references":[{"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-9492-427f-466x","label":"GitHub Security Advisory (GHSA-9492-427f-466x)"},{"url":"https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.7-alpha.1-redos-via-email-validation-regex","label":"VulnCheck Advisory: Parse Server 9.0.0 before 9.10.7-alpha.1 ReDoS via Email Validation Regex"}],"tags":["cve.org"],"ingestedAt":"2026-11-06T15:54:04.093Z","epss":0.00383,"epssPercentile":0.32555,"slug":"CVE-2026-123487","body":"## Overview\n\nParse 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.\n\n## Affected\n\n- `parse-server >= 9.0.0 < 9.10.7-alpha.1`\n- `parse-server < 8.6.115`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}