CVE-2026-23962

HIGH EPSS 38.3%
Published Jan 22, 20265mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Jan 22, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
38.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-770

Affected Products 3

VendorProductVersionRange
joinmastodonmastodon* <4.3.18
joinmastodonmastodon*≥4.4.0  –  <4.4.12
joinmastodonmastodon*≥4.5.0  –  <4.5.5

References 4

  • github.com https://github.com/mastodon/mastodon/releases/tag/v4.3.18
    Release Notes
  • github.com https://github.com/mastodon/mastodon/releases/tag/v4.4.12
    Release Notes
  • github.com https://github.com/mastodon/mastodon/releases/tag/v4.5.5
    Release Notes
  • github.com https://github.com/mastodon/mastodon/security/advisories/GHSA-gg8q-rcg7-p79g
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.