CVE-2018-12615: Phusion Passenger

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

An issue was discovered in switchGroup() in agent/ExecHelper/ExecHelperMain.cpp in Phusion Passenger before 5.3.2. The set of groups (gidset) is not set correctly, leaving it up to randomness (i.e., uninitialized memory) which supplementary groups are actually being set while lowering privileges.

Affected products

• Phusion Passenger: before 5.3.2 (fixed in 5.3.2)

Published 2018-06-21. Last modified 2026-06-17.