A flaw was found in libsoup's SoupServer HTTP Range header processing. The sort_ranges() comparator function in soup-message-headers.c returns the difference of two goffset (64-bit) values as an int (32-bit). When two range start positions in a multi-range request differ by more than INT_MAX (~2.1 billion), the truncation flips the comparison result sign, violating qsort's ordering contract. The mis-sorted ranges are then incorrectly merged, causing the server to silently omit requested byte ranges from the HTTP 206 Partial Content response. A remote unauthenticated attacker can trigger this by sending a multi-range Range request for a resource larger than approximately 2 GB, with range start offsets more than INT_MAX apart. The client receives fewer ranges than requested with no error indication, compromising data integrity for resumable downloads, delta updates, mirror synchronization, and chunked verification of large objects.