| tiêu đề | dloebl CGIF v0.4.0 to v0.5.2 Integer Overflow |
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| Mô tả | CGIF is a fast and lightweight GIF encoder that can create GIF animations and images.
This code is vulnerable to CWE-190: Integer Overflow due to improper type handling in the pixel count calculation within the cgif_addframe function at line 521 of src/cgif.c. The function calculates the total number of pixels using direct multiplication (width * height) when comparing adjacent frames. When processing an oversized GIF, the multiplication of operands of type uint16_t is implicitly promoted to a signed int type and overflows, resulting in a negative value. This negative value acts as a loop condition, causing the frame comparison loop to not execute at all. As a result, frames with completely different content are incorrectly judged to be identical and discarded through optimization, potentially leading to missing frames or data corruption in the generated GIF animation. |
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| Nguồn | ⚠️ https://github.com/dloebl/cgif/issues/110 |
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| Người dùng | zzxzzb (UID 95450) |
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| Đệ trình | 12/03/2026 03:21 (cách đây 4 các tháng) |
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| Kiểm duyệt | 27/03/2026 13:47 (15 days later) |
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| Trạng thái | được chấp nhận |
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| Mục VulDB | 353874 [dloebl CGIF đến 0.5.2 GIF Image src/cgif.c cgif_addframe width/height tràn bộ đệm] |
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| điểm | 20 |
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