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      <title>CVE-2026-47746 — Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-47746</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; misskey-dev misskey&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; misskey-dev misskey&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</content:encoded>
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