CVE-2026-23963 (GCVE-0-2026-23963)
Vulnerability from cvelistv5
Published
2026-01-22 01:53
Modified
2026-01-22 17:32
Severity ?
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
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.
References
Impacted products
Vendor Product Version
mastodon mastodon Version: < 4.3.18
Version: >= 4.4.0, < 4.4.12
Version: >= 4.5.0, < 4.5.5
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