6.5

CVE-2026-23963

Mastodon missing length limits on list names, filter names, and filter keywords

Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 4.5.5, 4.4.12, and 4.3.18, the server does not enforce a maximum length for the names of lists or filters, or for filter keywords, allowing any user to set an arbitrarily long string as the name or keyword. Any local user can abuse the list or filter fields to cause disproportionate storage and computing resource usage. They can additionally cause their own web interface to be unusable, although they must intentionally do this to themselves or unknowingly approve a malicious API client. Mastodon versions v4.5.5, v4.4.12, v4.3.18 are patched.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Joinmastodon ≫ Mastodon Version < 4.3.18
Joinmastodon ≫ Mastodon Version >= 4.4.0 < 4.4.12
Joinmastodon ≫ Mastodon Version >= 4.5.0 < 4.5.5
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.3% 0.21
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 6.5 2.8 3.6
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
security-advisories@github.com 4.3 2.8 1.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CWE-770 Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.

https://github.com/mastodon/mastodon/releases/tag/v4.3.18
Release Notes
https://github.com/mastodon/mastodon/releases/tag/v4.4.12
Release Notes
https://github.com/mastodon/mastodon/releases/tag/v4.5.5
Release Notes
https://github.com/mastodon/mastodon/security/advisories/GHSA-6x3w-9g92-gvf3
Vendor Advisory