CVE-2026-50129
Mastodon: Persistent anonymous DoS via unhandled NoMethodError in MATH_TRANSFORMER
7.5
HIGH
CVSS 3.1
EPSS 0.26%
Description
Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.11, 4.4.18, and 4.3.24, a DoS can be triggered by (Uncaught Exception vulerability), due to missing exception handling in the math sanitizer. Malformed <math> nodes can result in a DoS of a whole server or targeted users services, depending on the type of action that includes the malformed nodes and the services interacting with it. This vulnerability is fixed in 4.5.11, 4.4.18, and 4.3.24.
How to fix CVE-2026-50129
To remediate CVE-2026-50129, upgrade the affected package to a fixed version below.
- —upgrade to 4.3.24 or later
Is CVE-2026-50129 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 4.3.24, >= 4.4.0, < 4.4.18, >= 4.5.0, < 4.5.11
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |