#19237: The use of > in single or double quoted attributes in strip_tags
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Reporter: chris.khoo@… | Owner: khoomeister
Type: Bug | Status: new
Component: Utilities | Version: master
Severity: Release blocker | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by simon29):
Finally, after nearly two weeks I've found the reason why my servers kept
crashing on a high traffic, multi server production site :-(
This new regex is prone to catastrophic backtracking; which, when given
the right string, spins the CPU into an infinite loop. Performance issues
is an understatement. Sorry, but this regex literally crashes sites and
absolutely cannot be included.
http://www.regular-expressions.info/catastrophic.html
http://stackoverflow.com/questions/6230489/100-cpu-usage-with-a-regexp-
depending-on-input-length
We need to revert this change until we have a parser-based implementation.
I'll attach a sample "problem string" for y'all to play with.
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Ticket URL: <https://code.djangoproject.com/ticket/19237#comment:29>
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