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Date: Thu, 28 Sep 2023 16:42:33 -0400
From: Demi Marie Obenour <>
Subject: Re: CVE-2023-5217: Heap buffer overflow in vp8
 encoding in libvpx

On Thu, Sep 28, 2023 at 11:37:23AM -0700, Alan Coopersmith wrote:
> Google has announced another media parsing bug, this time correctly documenting
> both the base library and Chrome versions affected in the CVE.
> states:
>    Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to
>    117.0.5938.132 and libvpx 1.13.1 allowed a remote attacker to potentially
>    exploit heap corruption via a crafted HTML page.
>    (Chromium security severity: High)
> Unfortunately, the bug report it points to is restricted access still:
> But the Chrome release notes state:
>    Google is aware that an exploit for CVE-2023-5217 exists in the wild.
> Mozilla has put out their own security advisory at
> and delivered fixes in Firefox 118.0.1, Firefox ESR 115.3.1,
> Firefox Focus for Android 118.1, and Firefox for Android 118.1.
> is also still
> restricted access.
> It does not appear that libvpx 1.13.1 has been released yet, but there
> are two commits in its git repo with the 1486441 bug id listed:
> Mozilla's commit references these two libvpx commit ids as well:

How long will it take for corporations to accept that writing media
codecs in C, C++, or any other memory-unsafe language is a fundamentally
bad idea, and that it is better to rewrite the codecs in a safe language
(such as Wuffs or Rust) than to try to secure the existing ones?
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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