CVE-2026-50129
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk18th percentile — higher than 18% of all known CVEs
Summary
Mastodon prior to versions 4.5.11, 4.4.18, and 4.3.24 contains a DoS vulnerability due to missing exception handling in the math sanitizer. Malformed <math> nodes can lead to a DoS of the entire server or targeted user services, depending on the actions involving those nodes.
Risk Assessment
The organization may experience downtime of the server or user services, potentially leading to loss of availability and trust in the platform.
Recommendation
It is recommended to upgrade to versions 4.5.11, 4.4.18, or 4.3.24 to mitigate this vulnerability.
Original NVD description (English source)
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.