A giflib security update has been released for Debian GNU/Linux 10 LTS to fixes two file format vulnerabilities.

DLA 3223-1: giflib security update

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Debian LTS Advisory DLA-3223-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Helmut Grohne
December 05, 2022   https://wiki.debian.org/LTS
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Package : giflib
Version : 5.1.4-3+deb10u1
CVE ID : CVE-2018-11490 CVE-2019-15133
Debian Bug : 904114

This update fixes two file format vulnerabilities in giflib.

CVE-2018-11490

The DGifDecompressLine function in dgif_lib.c, as later shipped in
cgif.c in sam2p 0.49.4, has a heap-based buffer overflow because a
certain "Private->RunningCode - 2" array index is not checked. This
will lead to a denial of service or possibly unspecified other
impact.

CVE-2019-15133

A malformed GIF file triggers a divide-by-zero exception in the
decoder function DGifSlurp in dgif_lib.c if the height field of the
ImageSize data structure is equal to zero.

For Debian 10 buster, these problems have been fixed in version
5.1.4-3+deb10u1.

We recommend that you upgrade your giflib packages.

For the detailed security status of giflib please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/giflib

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS