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Mend.io Vulnerability Database
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CVE-2026-23962
Good to know:
Date: January 21, 2026
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.
Severity Score
Related Resources (6)
Severity Score
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
CWE-770Top Fix
Upgrade Version
Upgrade to version https://github.com/mastodon/mastodon.git - v4.5.5;https://github.com/mastodon/mastodon.git - v4.4.12;https://github.com/mastodon/mastodon.git - v4.3.18
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | NONE |
| Availability (A): | HIGH |