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CVE-2026-47138

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medium advisory

Parse Server Pre-authentication Denial of Service via Client Version Header

A denial-of-service vulnerability, CVE-2026-47138, exists in Parse Server due to inefficient regular expression handling of the client SDK version field in HTTP requests, allowing an unauthenticated attacker to exhaust server resources by sending a crafted request with a malicious `X-Parse-Client-Version` header or `_ClientVersion` body field.

parse-server denial-of-service regex-backtracking CVE-2026-47138
2r 1t