CVE-2016-5766

Publication date 24 June 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libgd2	16.04 LTS xenial	Fixed 2.1.1-4ubuntu0.16.04.2
	15.10 wily	Fixed 2.1.1-4ubuntu0.15.10.2
	14.04 LTS trusty	Fixed 2.1.0-3ubuntu0.2
	12.04 LTS precise	Fixed 2.0.36~rc1~dfsg-6ubuntu2.2
php5	16.04 LTS xenial	Not in release
	15.10 wily	Not affected
	14.04 LTS trusty	Not affected
	12.04 LTS precise	Not affected
php7.0	16.04 LTS xenial	Not affected
	15.10 wily	Not in release
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not in release

Notes

mdeslaur

php uses the system libgd2

sbeattie

PEAR issues should go against php-pear as of xenial

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libgd2	Upstream: aba3db8 Upstream: a6a0e7f
php7.0	Upstream: http://git.php.net/?p=php-src.git;a=commit;h=7722455726bec8c53458a32851d2a87982cf0eac

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H