Parse Server: Pre-authentication denial of service via client version header regex backtracking

Impact 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...

PT-2026-42860

Name of the Vulnerable Software and Affected Versions Parse Server affected versions not specified Description An unauthenticated attacker with knowledge of a public Parse Application ID can cause a denial of service by submitting a single HTTP request to any '/parse/' endpoint. The attack involv...