CVE-2016-8670: Integer signedness error in the dynamicGetbuf function in gd_io_dp.c in the GD Graphics Library (aka libgd)...

Security readout for executives and security teams

CVE-2016-8670 is a memory handling flaw in GD/libgd image parsing, also used by affected PHP versions. A specially crafted image processed through imagecreatefromstring could crash a service and may have other unspecified impact. Business risk depends on whether public users can submit images that backend PHP/GD code parses. Most likely exposure is web applications, APIs, CMS plugins, or upload pipelines that pass attacker-controlled image bytes to PHP GD imagecreatefromstring or linked libgd image parsing. Systems without untrusted image ingestion are less likely to be reachable. Prioritize patching internet-facing systems that process uploaded images. The primary documented impact is service crash, but the stack overflow nature and broad PHP/GD usage justify prompt remediation where exposure exists. Mitigation focus: Upgrade PHP to 5.6.28, 7.0.13, or later supported vendor builds.; Upgrade libgd beyond affected 2.2.3-era packages using vendor advisories.; Apply Debian, PHP, F5, or distribution-specific fixed packages where applicable..

Prepared

Jun 13, 2026, 12:51 UTC (UTC+00:00)

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