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Mon May 28 23:08:24 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-May/153740.html

On Thursday, May 17, 2018, Serhiy Storchaka <storchaka at gmail.com> wrote:

> [...]
>
> I'm trying to figure out some intentions and fix possible bugs in the xml
> package.

defusedxml
https://pypi.org/project/defusedxml/

> XML bomb protection for Python stdlib modules

https://pypi.org/project/defusedxml/#how-to-avoid-xml-vulnerabilities

"""
Best practices
- Don’t allow DTDs
- Don’t expand entities
- Don’t resolve externals
- Limit parse depth
- Limit total input size
- Limit parse time
- Favor a SAX or iterparse-like parser for potential large data
- Validate and properly quote arguments to XSL transformations and XPath
queries
- Don’t use XPath expression from untrusted sources
- Don’t apply XSL transformations that come untrusted sources
"""

https://github.com/tiran/defusedxml

> The history of all commits could help.
>
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[Python-Dev] The history of PyXML