Arch Linux Security Advisory ASA-202102-20 ========================================== Severity: Low Date : 2021-02-07 CVE-ID : CVE-2020-28493 Package : python2-jinja Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-1523 Summary ======= The package python2-jinja before version 2.11.3-1 is vulnerable to denial of service. Resolution ========== Upgrade to 2.11.3-1. # pacman -Syu "python2-jinja>=2.11.3-1" The problem has been fixed upstream in version 2.11.3. Workaround ========== None. Description =========== A security issue was found in python-jinja before version 2.11.3. The regular expression denial of service vulnerability is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory. Impact ====== A remote user might cause a huge CPU utilization via specially crafted input. References ========== https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994 https://github.com/pallets/jinja/pull/1343 https://github.com/pallets/jinja/commit/ef658dc3b6389b091d608e710a810ce8b879... https://security.archlinux.org/CVE-2020-28493