The PDORow implementation in PHP before 5.3.9 does not properly interact with the session feature, which allows remote attackers to cause a denial of service (application crash) via a crafted application that uses a PDO driver for a fetch and then calls the session_start function, as demonstrated by a crash of the Apache HTTP Server.
Severity
Medium 5.0
Published
14 Feb 2012
Last changed
16 Jun 2026
Added to UpHeron
14 Oct 2026
Exploit chance
8.6% in the next 30 daysHigher than 95% of CVEs. EPSS by FIRST, 12 Nov 2026