Description
p_mach.cpp in UPX 3.94 allows remote attackers to cause a denial of service (invalid memory access and application crash) or possibly have unspecified other impact via a crafted Mach-O file, related to canPack and unpack functions. NOTE: the vendor has stated "there is no security implication whatsoever.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | upx-ucl | 3.94-4 | — |
| Debian 13 | upx-ucl | 3.94-4 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | upx | 3.96-3.2 | openSUSE-SU-2024:11486-1 |
Advisories 1
- openSUSE-SU-2024:11486-1 upx-3.96-3.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026