CVE-2026-47138

CVE-2026-47138 · Parse Server: Pre-authentication denial of service via client version header regex backtracking

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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.

CVSS 8.7 · Élevée · EPSS 0,6% · Correctif disponible

Publication

2026-06-12T18:22:02.751Z

Mise à jour

2026-06-12T18:56:14.419Z

Pile logicielle: node

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