CVE-2026-33020
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
libsixel to implementacja kodera/dekodera SIXEL, która w wersjach 1.8.7 i wcześniejszych zawiera przepełnienie całkowite, prowadzące do przepełnienia bufora na stercie. Problem występuje w funkcji sixel_frame_convert_to_rgb888(), gdzie obliczenia rozmiaru alokacji i przesunięcia wskaźnika dla obrazów z paletą są wykonywane przy użyciu arytmetyki całkowitej.
Risk Assessment
Atakujący może dostarczyć specjalnie przygotowany, duży obraz PNG z paletą, co może prowadzić do uszkodzenia sterty procesu ofiary, skutkując awarią oraz potencjalnym wykonaniem dowolnego kodu. To stwarza poważne zagrożenie dla bezpieczeństwa aplikacji korzystających z tej biblioteki.
Recommendation
Zaleca się aktualizację do wersji 1.8.7-r1 lub nowszej, aby usunąć tę podatność. Należy również monitorować aplikacje korzystające z libsixel pod kątem nieautoryzowanego dostępu i potencjalnych ataków.
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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 an integer overflow which leads to a heap buffer overflow via sixel_frame_convert_to_rgb888() in frame.c, where allocation size and pointer offset computations for palettised images (PAL1, PAL2, PAL4) are performed using int arithmetic before casting to size_t. For images whose pixel count exceeds INT_MAX / 4, the overflow produces an undersized heap allocation for the conversion buffer and a negative pointer offset for the normalization sub-buffer, after which sixel_helper_normalize_pixelformat() writes the full image data starting from the invalid pointer, causing massive heap corruption confirmed by ASAN. An attacker providing a specially crafted large palettised PNG can corrupt the heap of the victim process, resulting in a reliable crash and potential arbitrary code execution. This issue has been fixed in version 1.8.7-r1.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

