CVE-2018-15503: Swoole

High severity, CVSS 7.5. EPSS: 2.3% chance of exploitation in the next 30 days.

The unpack implementation in Swoole version 4.0.4 lacks correct size checks in the deserialization process. An attacker can craft a serialized object to exploit this vulnerability and cause a SEGV.

Affected products

• Swoole Swoole: version 4.0.4 only

Published 2018-08-18. Last modified 2026-06-17.