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CVE-2025-55662 is a divide-by-zero vulnerability in GPAC/MP4Box affecting gpac/gpac prior to fix commit ff8249a407685d00ceb5f4d2a798b9cad195140e. The flaw is in gf_opus_parse_packet_header() in media_tools/av_parsers.c while processing an MP4 file containing an Opus audio track with malformed packet or header parameters. Specifically, critical Opus packet fields such as nb_frames are not validated before being used in arithmetic; the available reporting notes logic equivalent to computing values derived from header->nb_frames without first ensuring the field is non-zero and otherwise valid. When MP4Box reaches the Opus dump path on a crafted file, this can trigger a division by zero and terminate the process with a floating-point exception, with published traces pointing to media_tools/av_parsers.c:11479 and call paths including gf_inspect_dump_opus_internal() and dump_isom_opus().
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