{"id":"CVE-2026-123487","aliases":["EUVD-2026-118287","GHSA-9492-427f-466x","GHSA-r7pw-r949-xvmf"],"status":"published","title":"Parse Server 9.0.0 before 9.10.7-alpha.1 ReDoS via Email Validation Regex","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.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00383,"percentile":0.32803,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1333"],"published":"2026-11-06T15:00:49Z","modified":"2026-11-07T02:46:53Z","products":[{"vendor":"parse-community","product":"parse-server"}],"references":[{"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-9492-427f-466x","tags":["vendor-advisory","advisory"]},{"url":"https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.7-alpha.1-redos-via-email-validation-regex","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123487","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-r7pw-r949-xvmf"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123487.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-123487","title":"Parse Server 9.0.0 before 9.10.7-alpha.1 ReDoS via Email Validation Regex","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.","status":"published","published":"2026-11-06T15:00:49.384Z","modified":"2026-11-06T17:14:55.801Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-1333"],"updated_at":"2026-11-06T18:59:08.498645Z"}],"euvd":[{"id":"EUVD-2026-118287","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.","status":"published","published":"2026-11-06T15:00:49Z","modified":"2026-11-06T17:14:55Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-06T18:05:39.47551Z"}],"ghsa":[{"id":"GHSA-r7pw-r949-xvmf","title":"Parse Server before 8.6.115 and 9.0.0 before 9.10.7-alpha.1 validates user email address format...","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.","status":"published","published":"2026-11-06T15:31:27Z","modified":"2026-11-06T15:31:35Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-06T16:00:40.695019Z"}],"nvd":[{"id":"CVE-2026-123487","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.","status":"published","published":"2026-11-06T15:17:17.947Z","modified":"2026-11-06T18:18:03.383Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-1333"],"updated_at":"2026-11-06T20:01:16.993748Z"}],"osv":[{"id":"CVE-2026-123487","title":"Parse Server 9.0.0 before 9.10.7-alpha.1 ReDoS via Email Validation Regex","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.","status":"published","published":"2026-11-06T15:00:49.384Z","modified":"2026-11-08T02:31:06.048156942Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-07T03:08:01.726202Z"}]}}