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    <item>
      <title>CVE-2026-45076 — Synapse pagination denial of service</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-45076</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; element-hq synapse&lt;/p&gt;
&lt;p&gt;Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This vulnerability is fixed in 1.152.1.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; element-hq synapse&lt;/p&gt;
&lt;p&gt;Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This vulnerability is fixed in 1.152.1.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-45076</guid>
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      <title>GHSA-6qf2-7x63-mm6v — Synapse pagination Denial of Service</title>
      <link>https://cve.radiocsirt.org/vuln/ghsa-6qf2-7x63-mm6v</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; PyPI: matrix-synapse&lt;/p&gt;
&lt;p&gt;### Impact&lt;/p&gt;
&lt;p&gt;In federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients.&lt;/p&gt;
&lt;p&gt;Clients could therefore fail to display room history.&lt;/p&gt;
&lt;p&gt;### Patches&lt;/p&gt;
&lt;p&gt;Update to Synapse 1.152.1 or later.&lt;/p&gt;
&lt;p&gt;### Workarounds&lt;/p&gt;
&lt;p&gt;There are no known workarounds for this issue.&lt;/p&gt;
&lt;p&gt;### Identifiers&lt;/p&gt;
&lt;p&gt;- ELEMENTSEC-2025-1636&lt;/p&gt;
&lt;p&gt;### For more information&lt;/p&gt;
&lt;p&gt;If you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io).&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; PyPI: matrix-synapse&lt;/p&gt;
&lt;p&gt;### Impact&lt;/p&gt;
&lt;p&gt;In federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients.&lt;/p&gt;
&lt;p&gt;Clients could therefore fail to display room history.&lt;/p&gt;
&lt;p&gt;### Patches&lt;/p&gt;
&lt;p&gt;Update to Synapse 1.152.1 or later.&lt;/p&gt;
&lt;p&gt;### Workarounds&lt;/p&gt;
&lt;p&gt;There are no known workarounds for this issue.&lt;/p&gt;
&lt;p&gt;### Identifiers&lt;/p&gt;
&lt;p&gt;- ELEMENTSEC-2025-1636&lt;/p&gt;
&lt;p&gt;### For more information&lt;/p&gt;
&lt;p&gt;If you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io).&lt;/p&gt;</content:encoded>
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