CVE-2020-28493

This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDoS vulnerability is mainly due to the `_punctuation_re regex` operator and its use of multiple wildcards. The last wildcard is the most exploitable as it searches for trailing punctuation. 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.

• CWE-400

• https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20Broken Link
• https://github.com/pallets/jinja/pull/1343Patch, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4/
• https://security.gentoo.org/glsa/202107-19Third Party Advisory
• https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994Exploit, Third Party Advisory
• https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20Broken Link
• https://github.com/pallets/jinja/pull/1343Patch, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4/
• https://security.gentoo.org/glsa/202107-19Third Party Advisory
• https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994Exploit, Third Party Advisory

Published

Feb 1, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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