The deserialization code in PHP before 4.3.10 and PHP 5.x up to 5.0.2 allows remote attackers to cause a denial of service and execute arbitrary code via untrusted data to the unserialize function that may trigger "information disclosure, double-free and negative reference index array underflow" results.
Severity
High 10.0
Published
10 Jan 2005
Last changed
16 Jun 2026
Added to UpHeron
14 Oct 2026
Exploit chance
8% in the next 30 daysHigher than 94% of CVEs. EPSS by FIRST, 12 Nov 2026