CVE-2026-50129

Mastodon: Persistent anonymous DoS via unhandled NoMethodError in MATH_TRANSFORMER

State: Published
Severity: 7.5 High
Published: Jun 24, 2026
Updated: Jun 25, 2026
Reserved: Jun 3, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-248 Uncaught Exception

Affected Products

Product	Versions
mastodonmastodon	>= 4.5.0-beta.1, < 4.5.11Affected >= 4.4.0-beta.1, < 4.4.18Affected < 4.3.24Affected

References

https://github.com/mastodon/mastodon/security/advisories/GHSA-qrgq-9fx2-vf2r

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