CVE-2026-23962

· HIGHAnalyzed

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CVSS v3.1

7.5

EPSS

0.49%

Published

Jan 22, 2026

Modified

Feb 2, 2026

Public PoC / Exploit

All weaponized →

No public PoC or exploit code indexed for this CVE.

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-770

Affected Products (3)

joinmastodon · mastodon (up to 4.3.18)vulnerable

joinmastodon · mastodon (up to 4.4.12)vulnerable

joinmastodon · mastodon (up to 4.5.5)vulnerable

References (4)

https://github.com/mastodon/mastodon/releases/tag/v4.3.18

Release Notes

https://github.com/mastodon/mastodon/releases/tag/v4.4.12