An assertion abort was found in upx MemBuffer::alloc() in mem.cpp, in version UPX 4.0.0. The flow allows attackers to cause a denial of service (abort) via a crafted file.
https://github.com/upx/upx/commit/28e761cd42211dfe0124b7a29b2f74730f453e46
https://bugzilla.redhat.com/show_bug.cgi?id=1948696
https://github.com/upx/upx/pull/487
https://github.com/upx/upx/issues/486
Source: Mitre, NVD
Published: 2021-05-27
Updated: 2025-04-11
Base Score: 4.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P
Severity: Medium
Base Score: 5.5
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS: 0.00125