CVE-2026-50129

HIGH

Mastodon: Persistent anonymous DoS via unhandled NoMethodError in MATH_TRANSFORMER

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 7.5
EPSS 0.0026
EPSS Percentile 18.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-248
Status published
Products (3)
mastodon/mastodon < 4.3.24
mastodon/mastodon >= 4.4.0-beta.1, < 4.4.18
mastodon/mastodon >= 4.5.0-beta.1, < 4.5.11
Published Jun 24, 2026
Tracked Since Jun 25, 2026