A cgal security update has been released for Debian GNU/Linux 9 LTS to address four security issues.

DLA 2649-1: cgal security update

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Debian LTS Advisory DLA-2649-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
May 04, 2021   https://wiki.debian.org/LTS
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Package : cgal
Version : 4.9-1+deb9u1
CVE ID : CVE-2020-28601 CVE-2020-28636 CVE-2020-35628 CVE-2020-35636

Four security issues have been discovered in cgal. A code execution vulnerability exists
in the Nef polygon-parsing functionality of CGAL.

CVE-2020-28601

An oob read vulnerability exists in Nef_2/PM_io_parser.h PM_io_parser::read_vertex()
Face_of[] OOB read. An attacker can provide malicious input to trigger this vulnerability.

CVE-2020-28636

An oob read vulnerability exists in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sloop()
slh->twin() An attacker can provide malicious input to trigger this vulnerability.

CVE-2020-35628

An oob read vulnerability exists in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sloop()
slh->incident_sface. An attacker can provide malicious input to trigger this vulnerability.

CVE-2020-35636

An oob read vulnerability exists in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sface()
sfh->volume(). An attacker can provide malicious input to trigger this vulnerability.

For Debian 9 stretch, these problems have been fixed in version
4.9-1+deb9u1.

We recommend that you upgrade your cgal packages.

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

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