libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a wrong NULL check after an allocation call in sixel_decode_raw and sixel_decode causes a NULL pointer dereference whenever the allocation fails. The check tests the address of the output parameter (always non-NULL) instead of the value the malloc returned. On allocation failure, the function continues and writes through a NULL pointer, crashing the process. This is a denial of service against any caller of these public APIs that hits a low-memory condition. This vulnerability is fixed in 1.8.7-r2.
Exploitability
AV:LAC:HPR:NUI:RScope
S:UImpact
C:NI:NA:L2.5/CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:LMemory Safety
Other