CVE-2016-5771: Debian Linux

Critical severity, CVSS 9.8. EPSS: 15.5% chance of exploitation in the next 30 days.

spl_array.c in the SPL extension in PHP before 5.5.37 and 5.6.x before 5.6.23 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free and application crash) via crafted serialized data.

Affected products

• Debian Debian Linux: version 8.0 only
• Opensuse Leap: version 42.1 only
• Opensuse Opensuse: version 13.2 only
• PHP PHP: before 5.5.37 (fixed in 5.5.37); from 5.6.0, before 5.6.23 (fixed in 5.6.23); from 7.0.0, before 7.0.8 (fixed in 7.0.8)

Published 2016-08-07. Last modified 2026-06-17.