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CVE-2026-50129— Mastodon: Persistent anonymous DoS via unhandled NoMethodError in MATH_TRANSFORMER

Quick assessment

Affected
mastodon mastodon
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mastodon是Mastodon组织的一款去中心化社交网络服务器软件。 Mastodon 4.5.11之前版本、4.4.18之前版本和4.3.24之前版本存在异常处理不当漏洞，该漏洞源于数学清理器缺少异常处理，导致未捕获异常，畸形<math>节点可能导致整个服务器或目标用户服务拒绝服务。

CVSS 7.5 · High EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 3

VendorProduct Version RangeStatus
mastodon mastodon >= 4.5.0-beta.1, < 4.5.11 affected
>= 4.4.0-beta.1, < 4.4.18 affected
< 4.3.24 affected
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I. Basic Information for CVE-2026-50129

Vulnerability Information
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Vulnerability Title
Mastodon: Persistent anonymous DoS via unhandled NoMethodError in MATH_TRANSFORMER
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
Mastodon 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mastodon是Mastodon组织的一款去中心化社交网络服务器软件。 Mastodon 4.5.11之前版本、4.4.18之前版本和4.3.24之前版本存在异常处理不当漏洞，该漏洞源于数学清理器缺少异常处理，导致未捕获异常，畸形<math>节点可能导致整个服务器或目标用户服务拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mastodon mastodon >= 4.5.0-beta.1, < 4.5.11 -

II. Public POCs for CVE-2026-50129

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III. Intelligence Information for CVE-2026-50129

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Vendor Advisories for CVE-2026-50129 (1)

Same Patch Batch · mastodon · 2026-06-24 · 6 CVEs total

CVE-2026-47389 8.6 HIGH Mastodon: SSRF protection bypass on older Ruby versions
CVE-2026-48028 6.5 MEDIUM Mastodon: Removal of integrity-protected JSON entries from signed activities
CVE-2026-50128 5.3 MEDIUM Mastodon: Spoofing of attribution domains
CVE-2026-46349 5.3 MEDIUM Mastodon: LD-Signature Bypass via JSON-LD Named-Graph Restructuring
CVE-2026-46348 Mastodon: SSRF Bypass via IPv6 Unspecified Address (::)

IV. Related Vulnerabilities

Same product: mastodon
Same vendor: mastodon
Same weakness: CWE-248

V. Comments for CVE-2026-50129

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