CVE-2015-4603: The exception::getTraceAsString function in Zend/zend_exceptions.c in PHP before 5.4.40, 5.5.x before 5.5.2...

Security readout for executives and security teams

CVE-2015-4603 is a PHP runtime flaw in exception trace handling. On affected PHP 5.x versions, malformed unexpected data types could let a remote attacker execute arbitrary code. This matters most where legacy PHP runtimes are still serving web applications. Exposure is likely limited to legacy PHP 5.x deployments, downstream vendor packages, or old appliances embedding those runtimes. Systems already upgraded past the fixed PHP versions, or patched through vendor backports, are less likely exposed. Treat this as a legacy platform risk with potentially severe impact. If PHP 5 remains in production, prioritize verification and patching because arbitrary code execution in a web runtime can threaten application servers and hosted data. Mitigation focus: Upgrade PHP to 5.4.40, 5.5.24, 5.6.8, or a later supported release.; Apply applicable distribution security updates from Red Hat, Oracle, or your vendor.; Prioritize migration away from PHP 5 where still present..

Prepared

Jun 13, 2026, 14:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.