Integer underflow in the _gdContributionsAlloc function in gd_interpolation.c in the GD Graphics Library (aka libgd) before 2.2.4 allows remote attackers to have unspecified impact via vectors related to decrementing the u variable.
libgd.github.io/release-2.2.4.html
www.debian.org/security/2017/dsa-3777
www.openwall.com/lists/oss-security/2017/01/26/1
www.openwall.com/lists/oss-security/2017/01/28/6
www.securityfocus.com/bid/95869
access.redhat.com/errata/RHSA-2019:2519
access.redhat.com/errata/RHSA-2019:3299
github.com/libgd/libgd/commit/60bfb401ad5a4a8ae995dcd36372fe15c71e1a35