CVE-2026-33018
HighCVSS 7.0Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
libsixel to implementacja kodera/dekodera SIXEL, która w wersjach 1.8.7 i wcześniejszych zawiera podatność typu Use-After-Free w funkcji load_gif(). Problem polega na tym, że obiekt sixel_frame_t jest wielokrotnie używany w różnych klatkach animowanego GIF-a, co prowadzi do nieprawidłowego zarządzania pamięcią.
Risk Assessment
Organizacje korzystające z libsixel mogą doświadczyć awarii aplikacji lub potencjalnego wykonania złośliwego kodu, co stwarza poważne zagrożenie dla bezpieczeństwa systemów przetwarzających animowane GIF-y dostarczane przez użytkowników.
Recommendation
Zaleca się aktualizację do wersji 1.8.7-r1, w której problem został naprawiony, aby zminimalizować ryzyko związane z tą podatnością.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

