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FFmpeg versions 0.7.1 through 8.1.2 contain an out-of-bounds read vulnerability in the S/PDIF muxer, allowing attackers to exploit a missing bounds check in the `spdif_header_dts4` function by supplying a crafted DTS stream with an oversized `core_size` value during S/PDIF re-muxing, leading to unauthorized memory reads beyond the packet buffer and potential information disclosure or denial of service.