CVE-2026-123487 Parse Server 9.0.0 before 9.10.7-alpha.1 ReDoS via Email Validation Regex
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123487?
CVE-2026-123487 is a high-severity vulnerability in parse-community parse-server, published on 6 Nov 2026.
Official 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.
Weakness: CWE-1333
Which versions are affected by CVE-2026-123487?
How do I fix CVE-2026-123487?
No fix has been published for CVE-2026-123487 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123487 being exploited?
There is no known exploitation of CVE-2026-123487 in the wild and no public exploit code.
Sources
Also known as GHSA-9492-427f-466x, GHSA-r7pw-r949-xvmf.