Theme-Based Denial of Service in Misskey Web Client

Publication date: 2026-08-03

Last updated on: 2026-08-03

Assigner: GitHub, Inc.

Description

Misskey is an open source, federated social media platform. IVersions 8.63.0 and later, but prior to 2026.5.4, contain a vulnerability that can cause the Misskey web client to slow down or crash when it applies a malformed theme. This issue has been fixed in version 2026.5.4.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-03

Last Modified

2026-08-03

Generated

2026-08-04

AI Q&A

2026-08-04

EPSS Evaluated

N/A

NVD

CVE-2026-46714

Affected Vendors & Products

Vendor	Product	Version / Range
misskey	misskey	to 2026.5.4 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-674	The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

Attack-Flow Graph

Executive Summary

Misskey versions 8.63.0 to 2026.5.3 have a flaw where applying a malformed theme can slow down or crash the web client. This is fixed in version 2026.5.4.

Impact Analysis

Users may experience slow performance or crashes when a malformed theme is applied to the Misskey web client. This could disrupt access to the platform.

Mitigation Strategies

Update Misskey to version 2026.5.4 or later to address the vulnerability causing slowdowns or crashes from malformed themes.

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