CVE-2020-28493

Description

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.

References

https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994

https://security.gentoo.org/glsa/202107-19

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4/

https://github.com/pallets/jinja/pull/1343

https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4