opj_t1_clbl_decode_processor in openjp2/t1.c of OpenJPEG had a heap-based buffer overflow in the qmfbid==1 case, a similar but different issue than CVE-2020-6851.

For Debian 8 Jessie, this problem has been fixed in version 2.1.0-2+deb8u10.

We recommend that you upgrade your openjpeg2 packages.

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