rustsec-2026-0159
Vulnerability from osv_rustsec
Published
2026-06-03 12:00
Modified
2026-06-04 12:02
Summary
Sender-binding gaps in to-device messages
Details

The matrix-sdk-crypto crate before 0.16.1 is missing a check for the sender's user ID when decrypting an Olm-encrypted to-device message containing the sender_device_keys property.

This could be exploited to spoof the sender of an encrypted to-device message, but only if the attacker colludes with (or is) the homeserver operator.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "matrix-sdk-crypto",
        "purl": "pkg:cargo/matrix-sdk-crypto"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.12.0"
            },
            {
              "fixed": "0.16.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2026-45056",
    "GHSA-wfq4-36m3-9g42"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "The matrix-sdk-crypto crate before 0.16.1 is missing a check for the sender\u0027s\nuser ID when decrypting an Olm-encrypted to-device message containing the\nsender_device_keys property.\n\nThis could be exploited to spoof the sender of an encrypted to-device message,\nbut only if the attacker colludes with (or is) the homeserver operator.",
  "id": "RUSTSEC-2026-0159",
  "modified": "2026-06-04T12:02:36Z",
  "published": "2026-06-03T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/matrix-sdk-crypto"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0159.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-wfq4-36m3-9g42"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Sender-binding gaps in to-device messages"
}


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