Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/parse-community/parse-server/pull/10463
- https://github.com/parse-community/parse-server/pull/10464
- https://github.com/parse-community/parse-server/security/advisories/GHSA-38m6-82
FAQ
What is CVE-2026-47138?
CVE-2026-47138 is a documented vulnerability. 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-kno...
How severe is CVE-2026-47138?
CVSS scoring is not yet available for CVE-2026-47138. Check NVD for updates.
Is there a patch for CVE-2026-47138?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.