| 제목 | libvips 8.19.0(7fab325d2) Out-of-Bounds Read |
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| 설명 | In `libvips/conversion/unpremultiply.c`, function `vips_unpremultiply_build()` does not verify that user-provided `alpha_band` is smaller than `in->Bands`. In `vips_unpremultiply_gen()` (`UNPRE_MANY` path), `p[alpha_band]` and `q[alpha_band]` are accessed directly, leading to out-of-bounds memory access for oversized `--alpha-band` values. The issue is reachable via normal `vips unpremultiply` CLI usage and is reproducible with ASAN as `heap-buffer-overflow`. |
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| 원천 | ⚠️ https://github.com/libvips/libvips/issues/4881 |
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| 사용자 | Niebelungen (UID 95430) |
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| 제출 | 2026. 02. 15. PM 04:01 (4 개월 ago) |
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| 모더레이션 | 2026. 02. 26. PM 05:33 (11 days later) |
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| 상태 | 수락 |
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| VulDB 항목 | 348011 [libvips 8.19.0 unpremultiply.c vips_unpremultiply_build alpha_band 정보 공개] |
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| 포인트들 | 20 |
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