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Date: Mon, 9 Sep 2019 20:12:33 +0200
From: Marcin Kozlowski <>
Subject: Re: [FD] CVE 2019-13224 (UAF in PHP and Ruby regex lib)

Hi list,

Read about potential UAF in PHP and Ruby via regex library "oniguruma" (for
example here:

However, I didn't find default PHP and Ruby vulnerable:

My investigation showed the onig_new_deluxe() is not used by default.
However, modified PHP to use it and fuzzed it and was able to reproduce UAF
in 7 mins :)

Write me if I am wrong. Would like to investigate this great bug.


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