Answer in brief
CVE-2026-123487 records a High severity (CVSS 8.7) vulnerability in Parse Server 9.0.0 before 9.10.7-alpha.1 ReDoS via Email Validation Regex. The current sources do not mark it as known exploited. The current feed maps parse-community/parse-server (generic), parse-community/parse-server (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps parse-community/parse-server (generic), parse-community/parse-server (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| parse-community/parse-servergeneric | >=9.0.0 <9.10.7-alpha.1 | 9.10.7-alpha.1 |
| parse-community/parse-servergeneric | >=0 <8.6.115 | 8.6.115 |
Published upstream
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 6, 2026
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.
Quoted source text, attributed separately from HOL analysis.