Several vulnerabilities were discovered in GIMP, the GNU Image Manipulation Program, which could result in denial of service (application crash) or potentially the execution of arbitrary code if malformed files are opened.
For the oldstable distribution (jessie), these problems have been fixed in version 2.8.14-1+deb8u2.
For the stable distribution (stretch), these problems have been fixed in version 2.8.18-1+deb9u1.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/