CVE-2026-23962 Details
Description
Mastodon is a free, open-source social network server based on ActivityPub. Mastodon versions before v4.3.18, v4.4.12, and v4.5.5 do not have a limit on the maximum number of poll options for remote posts, allowing attackers to create polls with a very large amount of options, greatly increasing resource consumption. Depending on the number of poll options, an attacker can cause disproportionate resource usage in both Mastodon servers and clients, potentially causing Denial of Service either server-side or client-side. Mastodon versions v4.5.5, v4.4.12, v4.3.18 are patched.
A denial-of-service vulnerability has been identified in Mastodon, a social network server based on ActivityPub. The issue affects versions prior to v4.3.18, v4.4.12, and v4.5.5. The vulnerability arises from the lack of a limit on the maximum number of poll options for remote posts. This oversight allows attackers to create polls with an excessive number of options, significantly increasing resource consumption. Depending on the volume of poll options, this could lead to disproportionate resource usage on both Mastodon servers and clients, causing potential denial-of-service conditions either server-side or client-side.
Users can upgrade to Mastodon versions v4.3.18, v4.4.12, or v4.5.5 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jan 22, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| joinmastodon mastodon | < 4.3.18 >= 4.4.0, < 4.4.12 >= 4.5.0, < 4.5.5 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Feb 2, 2026 | Initial Analysis | [email protected] |
| Jan 22, 2026 | New CVE Received | [email protected] |