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A vulnerability (CVE-2026-55379) in Pillow's BdfFontFile component allows attackers to craft a malicious BDF font file with oversized BBX dimensions and an empty BITMAP section, bypassing documented decompression bomb protection and causing the Image.new() function to silently allocate large amounts of memory in the C-heap, leading to resource exhaustion and denial-of-service for applications processing untrusted BDF fonts.