| Título | GPAC GPAC 26.03-DEV Out-of-Bounds Read |
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| Descrição | GPAC 26.03-DEV is affected by an out-of-bounds read vulnerability in the VobSub subtitle parsing logic. The issue exists in the handling of repeated id: declarations in a crafted .idx file.
In vobsub_read_idx(), the parser stores language entries in a fixed-size langs[32] array but increments the num_langs counter for every accepted id: entry without preventing duplicate indexes or enforcing the array limit.
Later, vobsubdmx_parse_idx() iterates according to num_langs and accesses ctx->vobsub->langs[i].subpos. When more than 32 language entries are accepted, this results in an out-of-bounds read beyond the langs array.
An attacker can exploit this vulnerability by providing a specially crafted VobSub .idx subtitle file, causing GPAC or MP4Box to crash and resulting in a denial of service.
This vulnerability is classified as CWE-125: Out-of-bounds Read. |
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| Fonte | ⚠️ https://github.com/gpac/gpac/issues/3611 |
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| Utilizador | Fantasy_2026 (UID 98691) |
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| Submissão | 08/06/2026 04h15 (há 1 mês) |
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| Moderação | 09/07/2026 07h03 (1 month later) |
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| Estado | Aceite |
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| Entrada VulDB | 377111 [GPAC 26.03-DEV MP4Box vobsub.c vobsub_read_idx num_langs Divulgação de Informação] |
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| Pontos | 20 |
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