| Title | gpac v2.4.0 Out-of-bounds Write |
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| Description | When MP4Box imports SRT subtitles through the BIFS scene pipeline (-mp4 <scene>.bt with MuxInfo{textNode,fontNode}), gf_text_import_srt_bifs() converts subtitle text into UTF-8-like output but writes into a fixed stack buffer char szText[2048] without bounds checking. With crafted input (many high-bit bytes), the conversion expands the output and triggers an out-of-bounds write.
UBSan reports:
runtime error: index 2048 out of bounds for type 'char [2048]' inside gf_text_import_srt_bifs(). |
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| Source | ⚠️ https://github.com/gpac/gpac/issues/3425 |
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| User | Kery Qi (UID 94424) |
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| Submission | 01/12/2026 13:57 (8 months ago) |
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| Moderation | 01/25/2026 10:58 (13 days later) |
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| Status | Accepted |
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| VulDB entry | 342807 [GPAC up to 2.4.0 SRT Subtitle Import text_to_bifs.c gf_text_import_srt_bifs out-of-bounds write] |
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| Points | 20 |
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