Vulnerability-Lookup

PYSEC-2026-846

Vulnerability from pysec - Published: 2026-07-06 08:03 - Updated: 2026-07-06 08:03

Details

Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2⁶³ - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.

Severity

7.5 (High)


                  
                    CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impacted products

Name	purl
matrix-synapse	pkg:pypi/matrix-synapse

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse",
        "purl": "pkg:pypi/matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.28.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2018-10657",
    "GHSA-vmcc-4p4x-x7wg"
  ],
  "details": "Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2\u003csup\u003e63\u003c/sup\u003e - 1 render rooms unusable, related to `federation/federation_base.py` and `handlers/message.py`, as exploited in the wild in April 2018.",
  "id": "PYSEC-2026-846",
  "modified": "2026-07-06T08:03:24.087354Z",
  "published": "2026-07-06T08:03:24.087354Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-10657"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/commit/33f469ba19586bbafa0cf2c7d7c35463bdab87eb"
    },
    {
      "type": "WEB",
      "url": "https://docs.google.com/document/d/1I3fi2S-XnpO45qrpCsowZv8P8dHcNZ4fsBsbOW7KABI/edit#heading=h.fj95ykuss7s1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/synapse"
    },
    {
      "type": "WEB",
      "url": "https://matrix.org/blog/2018/05/01/security-update-synapse-0-28-1"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/matrix-synapse"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-vmcc-4p4x-x7wg"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Matrix Synapse DoS"
}

CVE-2018-10657 (GCVE-0-2018-10657)

Vulnerability from cvelistv5 – Published: 2018-05-02 16:00 – Updated: 2024-09-16 22:51

Summary

Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.

Severity

No CVSS data available.

CWE

Assigner

mitre

References

2 references

URL	Tags
https://matrix.org/blog/2018/05/01/security-updat…	x_refsource_CONFIRM
https://github.com/matrix-org/synapse/commit/33f4…	x_refsource_CONFIRM

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T07:46:46.270Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://matrix.org/blog/2018/05/01/security-update-synapse-0-28-1/"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/matrix-org/synapse/commit/33f469ba19586bbafa0cf2c7d7c35463bdab87eb"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2018-05-02T16:00:00.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://matrix.org/blog/2018/05/01/security-update-synapse-0-28-1/"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/matrix-org/synapse/commit/33f469ba19586bbafa0cf2c7d7c35463bdab87eb"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2018-10657",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://matrix.org/blog/2018/05/01/security-update-synapse-0-28-1/",
              "refsource": "CONFIRM",
              "url": "https://matrix.org/blog/2018/05/01/security-update-synapse-0-28-1/"
            },
            {
              "name": "https://github.com/matrix-org/synapse/commit/33f469ba19586bbafa0cf2c7d7c35463bdab87eb",
              "refsource": "CONFIRM",
              "url": "https://github.com/matrix-org/synapse/commit/33f469ba19586bbafa0cf2c7d7c35463bdab87eb"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2018-10657",
    "datePublished": "2018-05-02T16:00:00.000Z",
    "dateReserved": "2018-05-02T00:00:00.000Z",
    "dateUpdated": "2024-09-16T22:51:25.550Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

GHSA-VMCC-4P4X-X7WG

Vulnerability from github – Published: 2022-05-14 03:20 – Updated: 2023-10-06 17:20

Summary

Matrix Synapse DoS

Details

Severity

7.5 (High)


                  
                    CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.28.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2018-10657"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-07-25T19:54:26Z",
    "nvd_published_at": "2018-05-02T16:29:00Z",
    "severity": "HIGH"
  },
  "details": "Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2\u003csup\u003e63\u003c/sup\u003e - 1 render rooms unusable, related to `federation/federation_base.py` and `handlers/message.py`, as exploited in the wild in April 2018.",
  "id": "GHSA-vmcc-4p4x-x7wg",
  "modified": "2023-10-06T17:20:39Z",
  "published": "2022-05-14T03:20:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-10657"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/commit/33f469ba19586bbafa0cf2c7d7c35463bdab87eb"
    },
    {
      "type": "WEB",
      "url": "https://docs.google.com/document/d/1I3fi2S-XnpO45qrpCsowZv8P8dHcNZ4fsBsbOW7KABI/edit#heading=h.fj95ykuss7s1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/synapse"
    },
    {
      "type": "WEB",
      "url": "https://matrix.org/blog/2018/05/01/security-update-synapse-0-28-1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Matrix Synapse DoS"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

PYSEC-2026-846

CVE-2018-10657 (GCVE-0-2018-10657)

GHSA-VMCC-4P4X-X7WG

Tags

Sightings

Nomenclature