A Segmentation fault was found in UPX in PackLinuxElf64::invert_pt_dynamic() in p_lx_elf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.
https://github.com/upx/upx/issues/631
https://github.com/upx/upx/commit/779b648c5f6aa9b33f4728f79dd4d0efec0bf860