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    8 vulnerabilities found for socket.io by socketio

    CVE-2026-59725 (GCVE-0-2026-59725)

    Vulnerability from nvd – Published: 2026-07-08 15:37 – Updated: 2026-07-08 17:00
    VLAI
    Title
    Socket.IO: Engine.IO Polling Transport Connection Exhaustion
    Summary
    Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets. This issue is fixed in version 6.6.7.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-404 - Improper Resource Shutdown or Release
    Assigner
    References
    Impacted products
    Vendor Product Version
    socketio socket.io Affected: >= 4.1.0, < 6.6.7
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-59724 (GCVE-0-2026-59724)

    Vulnerability from nvd – Published: 2026-07-08 15:35 – Updated: 2026-07-08 19:41
    VLAI
    Title
    Socket.IO: Engine.IO WebTransport SID DoS
    Summary
    Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as __proto__ through an inherited property of the clients object during WebTransport upgrade handling, causing a TypeError and denial of service. This issue is fixed in version 6.6.7.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-20 - Improper Input Validation
    Assigner
    References
    Impacted products
    Vendor Product Version
    socketio socket.io Affected: >= 6.5.0, < 6.6.7
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-33151 (GCVE-0-2026-33151)

    Vulnerability from nvd – Published: 2026-03-20 20:13 – Updated: 2026-03-23 16:50
    VLAI
    Title
    socket.io allows an unbounded number of binary attachments
    Summary
    Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. Prior to versions 3.3.5, 3.4.4, and 4.2.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This issue has been patched in versions 3.3.5, 3.4.4, and 4.2.6.
    Severity
    8.7 (High)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-20 - Improper Input Validation
    • CWE-754 - Improper Check for Unusual or Exceptional Conditions
    Assigner
    References
    Impacted products
    Vendor Product Version
    socketio socket.io Affected: < 3.3.5
    Affected: >= 3.4.0, < 3.4.4
    Affected: >= 4.0.0, < 4.2.6
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2024-38355 (GCVE-0-2024-38355)

    Vulnerability from nvd – Published: 2024-06-19 19:48 – Updated: 2024-09-03 20:35
    VLAI
    Title
    Unhandled 'error' event in socket.io
    Summary
    Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process. This issue is fixed by commit `15af22fc22` which has been included in `socket.io@4.6.2` (released in May 2023). The fix was backported in the 2.x branch as well with commit `d30630ba10`. Users are advised to upgrade. Users unable to upgrade may attach a listener for the "error" event to catch these errors.
    Severity
    7.3 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-20 - Improper Input Validation
    • CWE-754 - Improper Check for Unusual or Exceptional Conditions
    Assigner
    References
    Impacted products
    Vendor Product Version
    socketio socket.io Affected: < 2.5.1
    Affected: >= 3.0.0,< 4.6.2
    		Create a notification for this product.
    socket socket.io Affected: 0 , < 2.5.1 (custom)
    Affected: 3.0.0 , < 4.6.2 (custom)
        cpe:2.3:a:socket:socket.io:*:*:*:*:*:node.js:*:*
    		 Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-59725 (GCVE-0-2026-59725)

    Vulnerability from cvelistv5 – Published: 2026-07-08 15:37 – Updated: 2026-07-08 17:00
    VLAI
    Title
    Socket.IO: Engine.IO Polling Transport Connection Exhaustion
    Summary
    Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets. This issue is fixed in version 6.6.7.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-404 - Improper Resource Shutdown or Release
    Assigner
    References
    Impacted products
    Vendor Product Version
    socketio socket.io Affected: >= 4.1.0, < 6.6.7
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-59724 (GCVE-0-2026-59724)

    Vulnerability from cvelistv5 – Published: 2026-07-08 15:35 – Updated: 2026-07-08 19:41
    VLAI
    Title
    Socket.IO: Engine.IO WebTransport SID DoS
    Summary
    Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as __proto__ through an inherited property of the clients object during WebTransport upgrade handling, causing a TypeError and denial of service. This issue is fixed in version 6.6.7.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-20 - Improper Input Validation
    Assigner
    References
    Impacted products
    Vendor Product Version
    socketio socket.io Affected: >= 6.5.0, < 6.6.7
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-33151 (GCVE-0-2026-33151)

    Vulnerability from cvelistv5 – Published: 2026-03-20 20:13 – Updated: 2026-03-23 16:50
    VLAI
    Title
    socket.io allows an unbounded number of binary attachments
    Summary
    Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. Prior to versions 3.3.5, 3.4.4, and 4.2.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This issue has been patched in versions 3.3.5, 3.4.4, and 4.2.6.
    Severity
    8.7 (High)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-20 - Improper Input Validation
    • CWE-754 - Improper Check for Unusual or Exceptional Conditions
    Assigner
    References
    Impacted products
    Vendor Product Version
    socketio socket.io Affected: < 3.3.5
    Affected: >= 3.4.0, < 3.4.4
    Affected: >= 4.0.0, < 4.2.6
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2024-38355 (GCVE-0-2024-38355)

    Vulnerability from cvelistv5 – Published: 2024-06-19 19:48 – Updated: 2024-09-03 20:35
    VLAI
    Title
    Unhandled 'error' event in socket.io
    Summary
    Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process. This issue is fixed by commit `15af22fc22` which has been included in `socket.io@4.6.2` (released in May 2023). The fix was backported in the 2.x branch as well with commit `d30630ba10`. Users are advised to upgrade. Users unable to upgrade may attach a listener for the "error" event to catch these errors.
    Severity
    7.3 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-20 - Improper Input Validation
    • CWE-754 - Improper Check for Unusual or Exceptional Conditions
    Assigner
    References
    Impacted products
    Vendor Product Version
    socketio socket.io Affected: < 2.5.1
    Affected: >= 3.0.0,< 4.6.2
    		Create a notification for this product.
    socket socket.io Affected: 0 , < 2.5.1 (custom)
    Affected: 3.0.0 , < 4.6.2 (custom)
        cpe:2.3:a:socket:socket.io:*:*:*:*:*:node.js:*:*
    		 Create a notification for this product.
    Show details on NVD website
    To clipboard 

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