CVE-2019-18183: Fedoraproject Fedora

Critical severity, CVSS 9.8. EPSS: 3.7% chance of exploitation in the next 30 days.

pacman before 5.2 is vulnerable to arbitrary command injection in lib/libalpm/sync.c in the apply_deltas() function. This can be exploited when unsigned databases are used. To exploit the vulnerability, the user must enable the non-default delta feature and retrieve an attacker-controlled crafted database and delta file.

Affected products

• Fedoraproject Fedora: version 30 only; version 31 only; version 32 only
• Pacman Project Pacman: before 5.2 (fixed in 5.2)

Published 2020-02-24. Last modified 2026-06-17.