A libde265 security update has been released for Debian GNU/Linux 10 LTS to address multiple issues.

DLA 3240-1: libde265 security update

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Debian LTS Advisory DLA-3240-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Tobias Frost
December 15, 2022   https://wiki.debian.org/LTS
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Package : libde265
Version : 1.0.3-1+deb10u1
CVE ID : CVE-2020-21599 CVE-2021-35452 CVE-2021-36408 CVE-2021-36409
CVE-2021-36410 CVE-2021-36411
Debian Bug : 1014977

Multiple issues were found in libde265, an open source implementation of the
h.265 video codec, which may result in denial of or have unspecified other
impact.

CVE-2020-21599

libde265 v1.0.4 contains a heap buffer overflow in the
de265_image::available_zscan function, which can be exploited via a crafted
a file.

CVE-2021-35452

An Incorrect Access Control vulnerability exists in libde265 v1.0.8 due to
a SEGV in slice.cc.

CVE-2021-36408

libde265 v1.0.8 contains a Heap-use-after-free in intrapred.h when decoding
file using dec265.

CVE-2021-36409

There is an Assertion `scaling_list_pred_matrix_id_delta==1' failed at
sps.cc:925 in libde265 v1.0.8 when decoding file, which allows attackers to
cause a Denial of Service (DoS) by running the application with a crafted
file or possibly have unspecified other impact.

CVE-2021-36410

A stack-buffer-overflow exists in libde265 v1.0.8 via fallback-motion.cc in
function put_epel_hv_fallback when running program dec265.

CVE-2021-36411

An issue has been found in libde265 v1.0.8 due to incorrect access control.
A SEGV caused by a READ memory access in function derive_boundaryStrength of
deblock.cc has occurred. The vulnerability causes a segmentation fault and
application crash, which leads to remote denial of service.

For Debian 10 buster, these problems have been fixed in version
1.0.3-1+deb10u1.

We recommend that you upgrade your libde265 packages.

For the detailed security status of libde265 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libde265

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