MEDIUM
The JPXStream::init function in Poppler 0.78.0 and earlier doesn't check for negative values of stream length, leading to an Integer Overflow, thereby making it possible to allocate a large memory chunk on the heap, with a size controlled by an attacker, as demonstrated by pdftocairo.
http://www.securityfocus.com/bid/109342
https://access.redhat.com/errata/RHSA-2019:2713
https://gitlab.freedesktop.org/poppler/poppler/blob/master/NEWS
https://lists.debian.org/debian-lts-announce/2019/10/msg00024.html
https://lists.debian.org/debian-lts-announce/2020/11/msg00014.html
Source: MITRE
Published: 2019-07-22
Updated: 2020-11-09
Type: CWE-190
Base Score: 4.3
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 2.8
Severity: MEDIUM