CVE-2016-4070: Integer overflow in the php_raw_url_encode function in ext/standard/url.c in PHP before 5.5.34, 5.6.x befor...

Security readout for executives and security teams

This CVE is a denial-of-service issue in older PHP versions. A very long value passed into PHP's rawurlencode function could trigger an integer overflow and crash the application. The vendor noted uncertainty about whether it qualifies as a security issue, so urgency depends on whether exposed applications process attacker-controlled long strings. Exposure is most likely in legacy PHP applications or bundled products running the affected PHP versions, especially where remote users can influence values passed to rawurlencode. Supported distribution packages may already include vendor backports. Treat this as a legacy-platform availability risk. Prioritize internet-facing or business-critical PHP systems first, especially unsupported versions. It is not supported by the provided sources as an active-exploitation emergency. Mitigation focus: Upgrade PHP to 5.5.34, 5.6.20, 7.0.5, or later fixed builds.; Apply vendor OS security updates from Ubuntu, Debian, Red Hat, SUSE, Apple, or HPE as applicable.; Migrate unsupported PHP branches to a supported runtime..

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.