What’s Vulnerable › Vulnerabilities

CVE-2016-5766

• Severity: high (CVSS 8.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 7.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2016-08-07 · updated 2026-06-17
• Weakness: CWE-190

Description

Integer overflow in the _gd2GetHeader function in gd_gd2.c in the GD Graphics Library (aka libgd) before 2.2.3, 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 crafted chunk dimensions in an image.

Affected products

• Debian Linux: 8.0
• Fedoraproject Fedora: 23, 24, 22
• FreeBSD: 8.3, 8.0, 10.0, 10.1, 8.4, 9.2 (+7)
• Libgd: 2.2.2
• Red Hat Enterprise Linux: 6.0, 5, 7.0
• Openshift: 2.0

References

• http://github.com/php/php-src/commit/7722455726bec8c53458a32851d2a87982cf0eac?w=1
• http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00004.html
• http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00025.html
• http://lists.opensuse.org/opensuse-updates/2016-08/msg00003.html
• http://php.net/ChangeLog-5.php
• http://php.net/ChangeLog-7.php
• http://rhn.redhat.com/errata/RHSA-2016-2598.html
• http://rhn.redhat.com/errata/RHSA-2016-2750.html
• http://www.debian.org/security/2016/dsa-3619
• http://www.openwall.com/lists/oss-security/2016/06/23/4
• http://www.ubuntu.com/usn/USN-3030-1
• https://bugs.php.net/bug.php?id=72339

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