Description
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a Use-After-Free vulnerability via the load_gif() function in fromgif.c, where a single sixel_frame_t object is reused across all frames of an animated GIF and gif_init_frame() unconditionally frees and reallocates frame->pixels between frames without consulting the object's reference count. Because the public API explicitly provides sixel_frame_ref() to retain a frame and sixel_frame_get_pixels() to access the raw pixel buffer, a callback following this documented usage pattern will hold a dangling pointer after the second frame is decoded, resulting in a heap use-after-free confirmed by ASAN. Any application using sixel_helper_load_image_file() with a multi-frame callback to process user-supplied animated GIFs is affected, with a reliable crash as the minimum impact and potential for code execution. This issue has been fixed in version 1.8.7-r1.
INFO
Published Date :
2026-04-14T21:45:42.261Z
Last Modified :
2026-04-16T13:53:25.060Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-33018 vulnerability.
| Vendors | Products |
|---|---|
| Saitoha |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33018.
