Sourced from The GitHub Security Advisory Database.

Regular Expression Denial of Service (ReDoS) This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex 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.

Affected versions: < 2.11.3

Sourced from jinja2's releases.

2.11.3

This contains a fix for a speed issue with the urlize filter. urlize is likely to be called on untrusted user input. For certain inputs some of the regular expressions used to parse the text could take a very long time due to backtracking. As part of the fix, the email matching became slightly stricter. The various speedups apply to urlize in general, not just the specific input cases.

• PyPI: https://pypi.org/project/Jinja2/2.11.3/
• Changes: https://jinja.palletsprojects.com/en/2.11.x/changelog/#version-2-11-3

Sourced from jinja2's changelog.

Version 2.11.3

Released 2021-01-31

• Improve the speed of the urlize filter by reducing regex backtracking. Email matching requires a word character at the start of the domain part, and only word characters in the TLD. 1343

• cf21539 release version 2.11.3
• 15ef8f0 Merge pull request #1343 from pallets/urlize-speedup
• ef658dc speed up urlize matching
• eeca0fe Merge pull request #1207 from mhansen/patch-1
• 2dd7691 Merge pull request #1209 from mhansen/patch-3
• 4892940 do_dictsort: update example ready to copy/paste
• 7db7d33 api.rst: bugfix in docs, import PackageLoader
• 9ec465b fix changelog header
• See full diff in compare view

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