CVE-2026-33019
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
libsixel to implementacja kodera/dekodera SIXEL, która w wersjach 1.8.7 i wcześniejszych zawiera błąd przepełnienia całkowitego prowadzący do odczytu poza granicami pamięci w obsłudze opcji --crop w img2sixel. Problem ten pozwala na przekroczenie granic bufora obrazu, co może prowadzić do awarii i potencjalnego ujawnienia informacji.
Risk Assessment
Organizacje mogą być narażone na awarie aplikacji oraz na wyciek wrażliwych danych w wyniku wykorzystania tej podatności przez atakującego, który dostarczy odpowiednio przygotowany argument crop.
Recommendation
Zaleca się aktualizację libsixel do wersji 1.8.7-r1 lub nowszej, aby usunąć tę podatność oraz wprowadzenie dodatkowych środków bezpieczeństwa w celu monitorowania i ograniczenia dostępu do aplikacji korzystających z tej biblioteki.
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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 leading to an out-of-bounds heap read in the --crop option handling of img2sixel, where positive coordinates up to INT_MAX are accepted without overflow-safe bounds checking. In sixel_encoder_do_clip(), the expression clip_w + clip_x overflows to a large negative value when clip_x is INT_MAX, causing the bounds guard to be skipped entirely, and the unclamped coordinate is passed through sixel_frame_clip() to clip(), which computes a source pointer far beyond the image buffer and passes it to memmove(). An attacker supplying a specially crafted crop argument with any valid image can trigger an out-of-bounds read in the heap, resulting in a reliable crash and potential information disclosure. This issue has been fixed in version 1.8.7-r1.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

