CVE-2026-91969 [MEDIUM] – vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the POST /api

vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the POST /api/v2/migration/csv/migrate endpoint that fails to limit parsed row cardinality. Authenticated attackers can upload multipart CSV files with millions of tiny records to exhaust process memory and terminate the API service.