matrix-sdk-crypto vulnerable to sender of encrypted events being spoofed by homeserver administrator

{
  "id": "9db4aa064267d45ea1e6ffc45c6f892b316abaacdb42bc393444d6389bbe66c6",
  "url": "https://osv.dev/vulnerability/CVE-2025-48937",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "matrix-sdk-crypto vulnerable to sender of encrypted events being spoofed by homeserver administrator",
    "summary": "matrix-rust-sdk is an implementation of a Matrix client-server library in Rust. matrix-sdk-crypto since version 0.8.0 and up to 0.11.0 does not correctly validate the sender of an encrypted event. Accordingly, a malicious homeserver operator can modify events served to clients, making those events appear to the recipient as if they were sent by another user. This vulnerability is fixed in 0.11.1 and 0.12.0.",
    "evidence": "osv:CVE-2025-48937",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-48937",
      "aliases": [
        "CVE-2025-48937",
        "GHSA-x958-rvg6-956w",
        "RUSTSEC-2025-0041"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/matrix-org/matrix-rust-sdk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0b16d488adc6122e7bacb6e11f5e39641fecc774"
                },
                {
                  "fixed": "76d1f8bd1895806d647d7c52a62ef611d14f2350"
                },
                {
                  "fixed": "13c1d2048286bbabf5e7bc6b015aafee98f04d55"
                },
                {
                  "fixed": "56980745b4f27f7dc72ac296e6aa003e5d92a75b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.8.0"
                      },
                      {
                        "fixed": "0.11.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "13c1d2048286bbabf5e7bc6b015aafee98f04d55"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "56980745b4f27f7dc72ac296e6aa003e5d92a75b"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "matrix-sdk-ui-0.11.0",
            "matrix-sdk-test-macros-0.11.0",
            "matrix-sdk-test-0.11.0",
            "matrix-sdk-store-encryption-0.11.0",
            "matrix-sdk-sqlite-0.11.0",
            "matrix-sdk-qrcode-0.11.0",
            "matrix-sdk-indexeddb-0.11.0",
            "matrix-sdk-ffi-0.11.0",
            "matrix-sdk-crypto-ffi-0.11.0",
            "matrix-sdk-crypto-0.11.0",
            "matrix-sdk-common-0.11.0",
            "matrix-sdk-base-0.11.0",
            "matrix-sdk-0.11.0",
            "matrix-sdk-ffi/20250408",
            "matrix-sdk-ffi/20250325",
            "matrix-sdk-ffi/20250320",
            "matrix-sdk-ffi/20250306",
            "matrix-sdk-ffi/20250225",
            "matrix-sdk-ffi/20252502",
            "matrix-sdk-ui-0.10.0",
            "matrix-sdk-test-macros-0.10.0",
            "matrix-sdk-test-0.10.0",
            "matrix-sdk-store-encryption-0.10.0",
            "matrix-sdk-sqlite-0.10.0",
            "matrix-sdk-qrcode-0.10.0",
            "matrix-sdk-indexeddb-0.10.0",
            "matrix-sdk-crypto-0.10.0",
            "matrix-sdk-common-0.10.0",
            "matrix-sdk-base-0.10.0",
            "matrix-sdk-0.10.0",
            "matrix-sdk-ffi/20250131",
            "matrix-sdk-ui-0.9.0",
            "matrix-sdk-store-encryption-0.9.0",
            "matrix-sdk-sqlite-0.9.0",
            "matrix-sdk-qrcode-0.9.0",
            "matrix-sdk-indexeddb-0.9.0",
            "matrix-sdk-crypto-0.9.0",
            "matrix-sdk-common-0.9.0",
            "matrix-sdk-base-0.9.0",
            "matrix-sdk-0.9.0",
            "matrix-sdk-ffi/20241204",
            "matrix-sdk-ffi/20241203",
            "matrix-sdk-ffi/20241127",
            "matrix-sdk-ui-0.8.0",
            "matrix-sdk-store-encryption-0.8.0",
            "matrix-sdk-sqlite-0.8.0",
            "matrix-sdk-qrcode-0.8.0",
            "matrix-sdk-indexeddb-0.8.0",
            "matrix-sdk-crypto-0.8.0",
            "matrix-sdk-common-0.8.0",
            "matrix-sdk-base-0.8.0",
            "matrix-sdk-0.8.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-48937.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.194950961Z",
      "provider": "osv",
      "references": [
        "https://spec.matrix.org/v1.14/client-server-api/#mmegolmv1aes-sha2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48937.json",
        "https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-x958-rvg6-956w",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-48937",
        "https://github.com/matrix-org/matrix-rust-sdk/commit/13c1d2048286bbabf5e7bc6b015aafee98f04d55",
        "https://github.com/matrix-org/matrix-rust-sdk/commit/56980745b4f27f7dc72ac296e6aa003e5d92a75b"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-290"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48937.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-48937",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491915,
  "published_at": "2025-06-10T15:32:00.822+00:00"
}