CVE-2015-4025: PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x before 5.6.9 truncates a pathname upon encountering a \x0...

Security readout for executives and security teams

Older PHP versions mishandled filenames containing a null byte. In affected application paths, an attacker could make PHP treat a pathname differently than intended, potentially bypassing extension checks and reaching unexpected files or directories. Exposure is most likely in legacy PHP applications or vendor-supported PHP packages that still run affected versions and pass remote input into the named pathname-related functions. Treat this as a legacy-platform risk. It is not evidenced as actively exploited here, but affected PHP branches are old and often carry broader operational risk. Prioritize internet-facing or file-handling applications first. Mitigation focus: Upgrade PHP to fixed versions or supported vendor backports.; Review Red Hat, Debian, Fedora, Apple, Oracle, and Gentoo advisories for package-specific fixes.; Retire unsupported PHP 5.4, 5.5, and 5.6 deployments where possible..

Prepared

Jun 13, 2026, 22:39 UTC (UTC+00:00)

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