GNU bug report logs - #66835
Heap buffer overread in expr in regexec.c in the check_arrival_add_next_nodes function.

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Some Dickhead <wheneveriseefeetibeatmymeat <at> gmail.com>, 66835 <at> debbugs.gnu.org
Subject: bug#66835: Heap buffer overread in expr in regexec.c in the check_arrival_add_next_nodes function.
Date: Tue, 7 Nov 2023 16:37:34 -0800

Thanks. This is a bug in the glibc regular expression matcher. It's part 
of a well known series of bugs. See, for example:

https://sourceware.org/bugzilla/show_bug.cgi?id=12896
https://sourceware.org/bugzilla/show_bug.cgi?id=17356

It's not of much practical concern since the attacker should not have 
control of B in invocations like 'expr "$A" : "$B"'.

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