CVE-2026-47138
HighCVSS 8.7Exploitation Probability (EPSS)
Low risk46th percentile - higher than 46% of all known CVEs
Summary
Parse Server prior to versions 8.6.77 and 9.9.1-alpha.1 is vulnerable to an attack where an unauthenticated user can send a malicious HTTP request, leading to excessive CPU consumption on the server.
Risk Assessment
An attacker can exploit this vulnerability to exhaust server resources, leading to service degradation and potential downtime in production.
Recommendation
It is recommended to upgrade to versions 8.6.77 or 9.9.1-alpha.1 to mitigate this vulnerability and to monitor network traffic for potential attack attempts.
Original NVD description (English source)
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.77 and 9.9.1-alpha.1, an unauthenticated attacker who knows a publicly-known Parse Application ID can submit a single HTTP request whose client SDK version field contains adversarial input that triggers polynomial backtracking in a request-header parser. The parsing runs before session authentication and before rate limiting on every /parse/* request, so the request consumes seconds to minutes of synchronous CPU on a Node.js worker before any access control evaluates it. A small number of concurrent requests can saturate a worker; a single large request via the body-field variant can pin a worker for minutes. Production deployments running the default configuration are affected. This issue has been patched in versions 8.6.77 and 9.9.1-alpha.1.