| Título | nothings stb (stb_truetype.h) ≤ 1.26 Out-of-Bounds Read |
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| Descrição |
A heap buffer overflow (out-of-bounds read) vulnerability exists in `stbtt__buf_get8()` in stb_truetype.h v1.26 and earlier. The function at line 1137 reads a single byte from a buffer object without properly validating that the current cursor position is within bounds. When processing a crafted font file with a CFF (Compact Font Format) table containing invalid offsets, the read exceeds the allocated buffer.
This is triggered during `stbtt_InitFont_internal()` at line 1424 when parsing CFF font data. Any application that calls `stbtt_InitFont()` on untrusted CFF/OpenType font data is affected.
ASAN output:
```
ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61100000012e
READ of size 1 at 0x61100000012e
#0 stbtt__buf_get8 stb_truetype.h:1137
#1 stbtt_InitFont_internal stb_truetype.h:1424
#2 stbtt_InitFont stb_truetype.h:4956
0x61100000012e is located 26 bytes to the right of 212-byte region
``` |
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| Fonte | ⚠️ https://gist.github.com/d0razi/c11dd07c75f3b795e4f8bbfd6e2f0d29 |
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| Utilizador | d0razi (UID 96474) |
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| Submissão | 16/03/2026 01h12 (há 24 dias) |
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| Moderação | 01/04/2026 14h40 (17 days later) |
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| Estado | Aceite |
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| Entrada VulDB | 354647 [Nothings stb até 1.26 TTF File stb_truetype.h stbtt__buf_get8 Divulgação de Informação] |
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| Pontos | 20 |
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