Main Vulnerability Database Vulnerabilities #VU139918

Uncaught Exception in Mastodon - CVE-2026-50129

Published: July 28, 2026

Vulnerability identifier: #VU139918

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-50129

CWE-ID: CWE-248

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncaught exception handling in MATH_TRANSFORMER when processing malformed $nodes. A remote attacker can post or send forged content to cause a denial of service.$

The issue can affect the whole server or specific user-facing services depending on the action containing the malformed nodes and the services interacting with it.

Affected software

Mastodon

How to mitigate CVE-2026-50129

Install security update from vendor's website.

Mastodon - addressed in versions 4.4.18, 4.5.11

External References

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

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