CVE-2026-23962 is a denial-of-service vulnerability affecting Mastodon versions prior to v4.3.18, v4.4.12, and v4.5.5. Attackers can create remote polls with an excessive number of options, leading to disproportionate resource consumption on both Mastodon servers and clients. This vulnerability has a CVSS score of 7.5 (HIGH), indicating a network-based attack with low complexity that can cause high availability impact. There is currently no evidence of active exploitation, no public exploit code, and it is not listed in the CISA KEV catalog, though it has garnered some community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 4.3.18CPE matchmatch criteria | cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* | ||
>= 4.4.0, < 4.4.12CPE matchmatch criteria | cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* | ||
>= 4.5.0, < 4.5.5CPE matchmatch criteria | cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.