Understanding and Defending Against Integer Overflow Vulnerability in libexpat
This educational analysis delves into CVE-2026-56407, an integer overflow vulnerability in libexpat before version 2.8.2. The vulnerability, which has a CVSS score of 6.9, is caused by an integer overflow in the doProlog function related to storeEntityValue and entity textLen. We will explore the root cause, attack surface, exploitation mechanics, real-world impact, detection strategies, and defensive measures to protect against this threat.