RootCauseunvalidated
PNG format includes 1-byte filter at start of each scanline — grub-core/video/readers/png.c. Tension: buffer allocation doesn't account for these filter bytes. Outcome: The overflow occurs in grub_png_output_byte() at line 600 when writing past allocated heap.
33d00ed9-7cc7-4d3c-b12d-d3a37d98bf2f
PNG format includes 1-byte filter at start of each scanline — grub-core/video/readers/png.c. Tension: buffer allocation doesn't account for these filter bytes. Outcome: The overflow occurs in grub_png_output_byte() at line 600 when writing past allocated heap.