From fd1824ecac5533a974224ac0287c21da705e3ffb Mon Sep 17 00:00:00 2001
From: "advisory-database[bot]"
 <45398580+advisory-database[bot]@users.noreply.github.com>
Date: Thu, 27 Mar 2025 18:04:08 +0000
Subject: [PATCH] Publish GHSA-v56r-hwv5-mxg6

---
 .../GHSA-v56r-hwv5-mxg6.json                  | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 advisories/github-reviewed/2025/03/GHSA-v56r-hwv5-mxg6/GHSA-v56r-hwv5-mxg6.json

diff --git a/advisories/github-reviewed/2025/03/GHSA-v56r-hwv5-mxg6/GHSA-v56r-hwv5-mxg6.json b/advisories/github-reviewed/2025/03/GHSA-v56r-hwv5-mxg6/GHSA-v56r-hwv5-mxg6.json
new file mode 100644
index 00000000000..7e674a97a58
--- /dev/null
+++ b/advisories/github-reviewed/2025/03/GHSA-v56r-hwv5-mxg6/GHSA-v56r-hwv5-mxg6.json
@@ -0,0 +1,69 @@
+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-v56r-hwv5-mxg6",
+  "modified": "2025-03-27T18:02:14Z",
+  "published": "2025-03-27T18:02:14Z",
+  "aliases": [
+    "CVE-2025-30355"
+  ],
+  "summary": "Synapse vulnerable to federation denial of service via malformed events",
+  "details": "### Impact\nA malicious server can craft events which, when received, prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild.\n\n### Patches\nFixed in Synapse v1.127.1.\n\n### Workarounds\nClosed federation environments of trusted servers or non-federating installations are not affected.\n\n### For more information\n\nIf you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io).",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "PyPI",
+        "name": "matrix-synapse"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "1.127.1"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/element-hq/synapse/security/advisories/GHSA-v56r-hwv5-mxg6"
+    },
+    {
+      "type": "ADVISORY",
+      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-30355"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/element-hq/synapse"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/element-hq/synapse/releases/tag/v1.127.1"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-20"
+    ],
+    "severity": "HIGH",
+    "github_reviewed": true,
+    "github_reviewed_at": "2025-03-27T18:02:14Z",
+    "nvd_published_at": "2025-03-27T01:15:12Z"
+  }
+}
\ No newline at end of file