In Pallets Jinja before 2.8.1, str.format allows a sandbox escape.
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00030.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00064.html
https://access.redhat.com/errata/RHSA-2019:1022
https://access.redhat.com/errata/RHSA-2019:1237
https://access.redhat.com/errata/RHSA-2019:1260
https://github.com/pallets/jinja/commit/9b53045c34e61013dc8f09b7e52a555fa16bed16
https://palletsprojects.com/blog/jinja-281-released/
Source: MITRE
Published: 2019-04-08
Updated: 2019-06-06
Type: CWE-134
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 8.6
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Impact Score: 4
Exploitability Score: 3.9
Severity: HIGH