PackLinuxElf64::unpack in p_lx_elf.cpp in UPX 3.95 allows remote attackers to cause a denial of service (double free), limit the ability of a malware scanner to operate on the entire original data, or possibly have unspecified other impact via a crafted file.
lists.opensuse.org/opensuse-security-announce/2020-02/msg00001.html
lists.opensuse.org/opensuse-security-announce/2020-02/msg00003.html
lists.opensuse.org/opensuse-security-announce/2020-02/msg00007.html
lists.opensuse.org/opensuse-security-announce/2020-02/msg00008.html
github.com/upx/upx/blob/devel/NEWS
github.com/upx/upx/issues/206
github.com/upx/upx/issues/207
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D7XU42G6MUQQXHWRP7DCF2JSIBOJ5GOO/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUTVSTXAFTD552NO2K2RIF6MDQEHP3BE/