CVE-2010-1861: The sysvshm extension for PHP 5.2 through 5.2.13 and 5.3 through 5.3.2 allows context-dependent attackers t...

Security readout for executives and security teams

This is an old PHP shared-memory extension flaw. A specially timed object behavior could cause PHP to use a freed resource and write to arbitrary memory. Business urgency depends on whether any legacy PHP 5.2 or early 5.3 systems remain in production. Exposure is most likely on legacy PHP hosts running affected PHP versions with sysvshm enabled. Modern supported PHP versions should not match the described affected range. Risk increases where application code can process attacker-influenced objects through shared-memory storage paths. Treat as a legacy exposure cleanup item unless affected PHP systems are internet-facing or business-critical. Unsupported PHP 5.2 and early 5.3 deployments should already be high-priority modernization targets. Mitigation focus: Inventory PHP versions and identify any PHP 5.2.x or PHP 5.3.0-5.3.2 deployments.; Disable the sysvshm extension where shared-memory variables are not required.; Move affected systems to a supported PHP version..

Prepared

Jun 28, 2026, 02:49 UTC (UTC+00:00)

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