Description
Mastodon is a free, open-source social network server based on ActivityPub. When performing outgoing HTTP queries, Mastodon sets a timeout on individual read operations. Prior to versions 3.5.9, 4.0.5, and 4.1.3, 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. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.
References (6)
Core 6
Core References
Third Party Advisory x_refsource_confirm
https://github.com/mastodon/mastodon/security/advisories/GHSA-9pxv-6qvf-pjwc
Patch, Third Party Advisory x_refsource_misc
https://github.com/mastodon/mastodon/commit/c5929798bf7e56cc2c79b15bed0c4692ded3dcb6
Third Party Advisory x_refsource_misc
https://github.com/mastodon/mastodon/releases/tag/v3.5.9
Third Party Advisory x_refsource_misc
https://github.com/mastodon/mastodon/releases/tag/v4.0.5
Third Party Advisory x_refsource_misc
https://github.com/mastodon/mastodon/releases/tag/v4.1.3
Scores
CVSS v3
7.5
EPSS
0.0022
EPSS Percentile
45.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-770
Status
published
Products (1)
joinmastodon/mastodon
< 3.5.9
Published
Jul 06, 2023
Tracked Since
Feb 18, 2026