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Date: Wed, 10 Apr 2024 19:57:11 +0800
From: Sean Whitton <>
To: Ihor Radchenko <>
Subject: Re: Is CVE-2024-30203 bogus? (Emacs)


On Mon 08 Apr 2024 at 06:44pm GMT, Ihor Radchenko wrote:

> Sean Whitton <> writes:
>> The description for CVE-2024-30203 is
>>     In Emacs before 29.3, Gnus treats inline MIME contents as trusted.
> Before Emacs 29.3, there was no concept of trusted or untrusted content
> in Emacs. We introduced it specifically to control whether we allow
> running LaTeX on the contents of a given buffer. (And even in Emacs
> 29.3, the concept of untrusted contents is not yet official) So, at least
> the title is misleading.

Right, it's a purely preliminary change, not fixing any holes in itself.

>> and for CVE-2024-30204 is
>>     In Emacs before 29.3, LaTeX preview is enabled by default for e-mail
>>     attachments.
> This is closer to what was happening.
> Note that LaTeX preview itself was not a problem. The problem was that we
> executed actual latex program without user query with input taken from
> buffer text to generate the previews (using the default settings). LaTeX
> input can be specifically constructed to cause DOS when using LaTeX
> compiler, which is especially dangerous when the input is coming from
> emails.
> Also, only GNUS and MUA clients re-using gnus libs (at least, notmuch
> and mu4e) were affected. Not rmail, AFAIK.
>> ...
>> I think it's the first one -- can you confirm?
> I hope that the above clarified things.

Hmm, thank you, but let me ask a follow-up question: do you agree with
me that there is only one security flaw covered by these two CVEs, and
CVE-2024-30203 is the superfluous one?

Sean Whitton

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