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Date: Thu, 6 Jul 2023 18:29:23 -0400
From: Jan Schaumann <>
Subject: CVE-2023-36461: mastodon: Denial of Service through slow HTTP

(I have no affiliation with the project, but posting
this here because it seems to me that increasingly
non-packaged / GitHub distributed projects tend not to
send out announcements here.)

(This advisory describes an issue found by Cure53 as
part of an audit performed at Mozilla's request)

When performing outgoing HTTP queries, Mastodon sets a
timeout on individual read operations, but a malicious
server can indefinitely extend the duration of the
response through slowloris-type attacks.

This vulnerability can be used to keep all Mastodon
workers busy for an extended duration of time, leading
to the server becoming unresponsive.


Severity: 7.5/10


Affected versions: all
Patched versions:  4.1.3, 4.0.5, 3.5.9

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