Gregory P. Smith <g...@krypto.org> added the comment:

I've merged Idan's PR adding a strict_mode parameter to a2b_base64.  It 
defaults to False for backwards compatibility.

>From a security perspective, it'd be _ideal_ if this were True.  But I expect 
>doing that would break a bunch of existing code and tests that has been 
>relying on some of the former leniency behaviors so I recommended the 
>conservative approach of the old-behavior default.  It'd be a good thing to 
>change it to True, but disruptive.  We need motivating reason to do that.

As it is a new feature due to the new parameter, this is for 3.11.

Workaround for Pythons without this: do a validity check before calling 
a2b_base64.  I suspect a regex could be constructed for that if you're careful. 
 If you come up with one, please share it here.

----------
components: +Extension Modules
resolution:  -> fixed
stage: patch review -> commit review
status: open -> closed
versions: +Python 3.11 -Python 3.10

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<https://bugs.python.org/issue43086>
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