---
id: CVE-2026-47746
title: 'Misskey is an open source, federated social media platform'
summary: >-
  Misskey is an open source, federated social media platform. Versions 12.37.0
  and later, but prior to 2026.5.4, are vulnerable to timing attacks during
  JSON-LD signature validation and the compaction process. Because the JSON-LD
  parsing c…
severity: none
cwe:
  - CWE-367
published: '2026-08-03'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:51:43.490'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-47746'
references:
  - url: 'https://github.com/misskey-dev/misskey/releases/tag/2026.5.4'
    label: security-advisories@github.com
  - url: >-
      https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00182
epssPercentile: 0.0807
ingestedAt: '2026-09-08T21:11:12.264Z'
---

## Overview

Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, are vulnerable to timing attacks during JSON-LD signature validation and the compaction process. Because the JSON-LD parsing context is not shared between signature verification and subsequent processing, the application may trust information that should not be trusted, resulting in a time-of-check to time-of-use (TOCTOU) flaw. This allows an attacker to have fraudulent activities accepted as valid, leading to a loss of integrity. This issue has been fixed in version 2026.5.4.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.