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Test your applicationsUpgrade RHEL:7 php-snmp to version 0:5.4.16-42.el7 or higher.
This issue was patched in RHSA-2016:2598.
Note: Versions mentioned in the description apply only to the upstream php-snmp package and not the php-snmp package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
Integer overflow in the gdImageCreate function in gd.c in the GD Graphics Library (aka libgd) before 2.0.34RC1, as used in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8, allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted image dimensions.