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    GHSA-CGWC-PV48-FHJ5

    Vulnerability from github – Published: 2026-06-26 20:51 – Updated: 2026-06-26 20:51
    VLAI
    Summary
    python-engineio has unbound thread allocation that can cause denial of service
    Details

    Impact

    An attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection is received, and when the client sends a PONG packet.

    Note: this issue primarily affects synchronous servers. Asynchronous servers allocate background tasks instead of physical threads, which are lightweight and less likely to cause denial of service. However, the fix that was implemented was also applied to the asynchronous case.

    Patches

    Version 4.13.2 addresses this issue as follows:

    • The initial background thread (or async task( for heartbeat management is only launched if a client passes authentication in the connect handler.
    • The server now ensures that there is only one background heatbeat thread (or async task) per client at a given point in time. Out of sequence PONG packets are now discarded when an active heartbeat thread is already running.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Show details on source website
    To clipboard 

    {
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.13.1"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "python-engineio"
      },
      "ranges": [
        {
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            {
              "introduced": "0"
            },
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              "fixed": "4.13.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
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  ],
  "aliases": [
    "CVE-2026-48802"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-26T20:51:37Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nAn attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection is received, and when the client sends a PONG packet.\n\nNote: this issue primarily affects synchronous servers. Asynchronous servers allocate background tasks instead of physical threads, which are lightweight and less likely to cause denial of service. However, the fix that was implemented was also applied to the asynchronous case.\n\n### Patches\nVersion 4.13.2 addresses this issue as follows:\n\n- The initial background thread (or async task( for heartbeat management is only launched if a client passes authentication in the `connect` handler.\n- The server now ensures that there is only one background heatbeat thread (or async task) per client at a given point in time. Out of sequence PONG packets are now discarded when an active heartbeat thread is already running.",
  "id": "GHSA-cgwc-pv48-fhj5",
  "modified": "2026-06-26T20:51:37Z",
  "published": "2026-06-26T20:51:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/miguelgrinberg/python-engineio/security/advisories/GHSA-cgwc-pv48-fhj5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/miguelgrinberg/python-engineio"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "python-engineio has unbound thread allocation that can cause denial of service"
}

    OPENSUSE-SU-2026:21182-1

    Vulnerability from csaf_opensuse - Published: 2026-06-30 11:31 - Updated: 2026-06-30 11:31
    Summary
    Security update for python-python-engineio
    Severity
    Important
    Notes
    Title of the patch: Security update for python-python-engineio
    Description of the patch: This update for python-python-engineio fixes the following issues: Changes in python-python-engineio: - CVE-2026-48802: remote user can cause the creation of unnecessary background threads in the server through the heartbeat mechanism and cause a DoS (bsc#1269544) - CVE-2026-48809: size of incoming messages is not checked before they are loaded into memory and allows remote users to cause a DoS via excessive memory allocation (bsc#1269545)
    Patchnames: openSUSE-Leap-16.0-packagehub-377
    Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
    CVE-2026-48802
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Affected products
    Product Identifier Version Remediation
    Unresolved product id: openSUSE Leap 16.0:python313-python-engineio-4.12.0-bp160.2.1.noarch —
    Vendor Fix
    Threats
    Impact important
    CVE-2026-48809
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Affected products
    Product Identifier Version Remediation
    Unresolved product id: openSUSE Leap 16.0:python313-python-engineio-4.12.0-bp160.2.1.noarch —
    Vendor Fix
    Threats
    Impact important
    References
    To clipboard 

    {
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        "text": "This update for python-python-engineio fixes the following issues:\n\nChanges in python-python-engineio:\n\n- CVE-2026-48802: remote user can cause the creation of unnecessary\n  background threads in the server through the heartbeat mechanism\n  and cause a DoS (bsc#1269544)\n- CVE-2026-48809: size of incoming messages is not checked before\n  they are loaded into memory and allows remote users to cause a DoS\n  via excessive memory allocation (bsc#1269545)\n",
        "title": "Description of the patch"
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          "date": "2026-06-30T11:31:41Z",
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      "title": "CVE-2026-48802"
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      "title": "CVE-2026-48809"
    }
  ]
}

    PYSEC-2026-3032

    Vulnerability from pysec - Published: 2026-07-13 15:46 - Updated: 2026-07-13 16:06
    VLAI
    Details

    Impact

    An attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection is received, and when the client sends a PONG packet.

    Note: this issue primarily affects synchronous servers. Asynchronous servers allocate background tasks instead of physical threads, which are lightweight and less likely to cause denial of service. However, the fix that was implemented was also applied to the asynchronous case.

    Patches

    Version 4.13.2 addresses this issue as follows:

    • The initial background thread (or async task( for heartbeat management is only launched if a client passes authentication in the connect handler.
    • The server now ensures that there is only one background heatbeat thread (or async task) per client at a given point in time. Out of sequence PONG packets are now discarded when an active heartbeat thread is already running.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Impacted products
    Name purl
    python-engineio pkg:pypi/python-engineio
    Aliases
    To clipboard 

    {
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "python-engineio",
        "purl": "pkg:pypi/python-engineio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.13.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.2.0",
        "0.3.0",
        "0.3.1",
        "0.4.0",
        "0.5.0",
        "0.5.1",
        "0.6.0",
        "0.6.1",
        "0.6.2",
        "0.6.3",
        "0.6.4",
        "0.6.5",
        "0.6.6",
        "0.6.7",
        "0.6.8",
        "0.6.9",
        "0.7.0",
        "0.7.1",
        "0.7.2",
        "0.8.0",
        "0.8.1",
        "0.8.2",
        "0.8.3",
        "0.8.4",
        "0.8.5",
        "0.8.6",
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        "0.8.8",
        "0.9.0",
        "0.9.1",
        "0.9.2",
        "1.0.0",
        "1.0.1",
        "1.0.2",
        "1.0.3",
        "1.0.4",
        "1.1.0",
        "1.1.1",
        "1.1.2",
        "1.2.0",
        "1.2.1",
        "1.2.2",
        "1.2.3",
        "1.2.4",
        "1.3.0",
        "1.3.1",
        "1.3.2",
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        "1.5.0",
        "1.5.1",
        "1.5.2",
        "1.5.3",
        "1.5.4",
        "1.6.0",
        "1.6.1",
        "1.7.0",
        "2.0.0",
        "2.0.1",
        "2.0.2",
        "2.0.3",
        "2.0.4",
        "2.1.0",
        "2.1.1",
        "2.2.0",
        "2.3.0",
        "2.3.1",
        "2.3.2",
        "3.0.0",
        "3.1.0",
        "3.1.1",
        "3.1.2",
        "3.10.0",
        "3.11.0",
        "3.11.1",
        "3.11.2",
        "3.12.0",
        "3.12.1",
        "3.13.0",
        "3.13.1",
        "3.13.2",
        "3.14.0",
        "3.14.1",
        "3.14.2",
        "3.2.0",
        "3.2.1",
        "3.2.2",
        "3.2.3",
        "3.3.0",
        "3.3.1",
        "3.3.2",
        "3.4.0",
        "3.4.1",
        "3.4.2",
        "3.4.3",
        "3.4.4",
        "3.5.0",
        "3.5.1",
        "3.5.2",
        "3.6.0",
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        "3.8.1",
        "3.8.2",
        "3.8.2.post1",
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        "3.9.1",
        "3.9.2",
        "3.9.3",
        "4.0.0",
        "4.0.1",
        "4.1.0",
        "4.10.0",
        "4.10.1",
        "4.11.0",
        "4.11.1",
        "4.11.2",
        "4.12.0",
        "4.12.1",
        "4.12.2",
        "4.12.3",
        "4.13.0",
        "4.13.1",
        "4.2.0",
        "4.2.1",
        "4.3.0",
        "4.3.1",
        "4.3.2",
        "4.3.3",
        "4.3.4",
        "4.4.0",
        "4.4.1",
        "4.5.0",
        "4.5.1",
        "4.6.0",
        "4.6.1",
        "4.7.0",
        "4.7.1",
        "4.8.0",
        "4.8.1",
        "4.8.2",
        "4.9.0",
        "4.9.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-48802",
    "GHSA-cgwc-pv48-fhj5"
  ],
  "details": "### Impact\nAn attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection is received, and when the client sends a PONG packet.\n\nNote: this issue primarily affects synchronous servers. Asynchronous servers allocate background tasks instead of physical threads, which are lightweight and less likely to cause denial of service. However, the fix that was implemented was also applied to the asynchronous case.\n\n### Patches\nVersion 4.13.2 addresses this issue as follows:\n\n- The initial background thread (or async task( for heartbeat management is only launched if a client passes authentication in the `connect` handler.\n- The server now ensures that there is only one background heatbeat thread (or async task) per client at a given point in time. Out of sequence PONG packets are now discarded when an active heartbeat thread is already running.",
  "id": "PYSEC-2026-3032",
  "modified": "2026-07-13T16:06:04.305823Z",
  "published": "2026-07-13T15:46:24.728707Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/miguelgrinberg/python-engineio/security/advisories/GHSA-cgwc-pv48-fhj5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/miguelgrinberg/python-engineio"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/python-engineio"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-cgwc-pv48-fhj5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48802"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "python-engineio has unbound thread allocation that can cause denial of service"
}