CVE-2026-69185

Socket.IO enables bidirectional and low-latency communication for every platform. Prior to 4.2.7, 3.4.5, and 3.3.6, 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 vulnerability is fixed in 4.2.7, 3.4.5, and 3.3.6.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-20",
        "CWE-754"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69185.json"
}

References

Affected packages

Git / github.com/socketio/socket.io

Affected ranges

Type

GIT

Repo

https://github.com/socketio/socket.io

Events

Introduced

Fixed

98e61b941fb9915614e0b962588817efb795020c

Fixed

e590976beb69f98faa44da7653f4ab55c5e0e61a

Introduced

5eaeffc8e2244b73dd13fd2562c9684ad289997b

Fixed

4054894738817f5a2125e6e6b18e79d92c75ab33

Fixed

7c6ef571a00656718e9e05e3b948fd1758b2a7b4

Fixed

9c6323e5cde41bd75df3379b5fc9293664a5f240

Fixed

ced94ffa3ac020a8f3c14eb98a3bf34acb14d291

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "3.3.6"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "introduced": "3.4.0"
                },
                {
                    "fixed": "3.4.5"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "introduced": "4.0.0"
                },
                {
                    "fixed": "4.2.7"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "7c6ef571a00656718e9e05e3b948fd1758b2a7b4"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "9c6323e5cde41bd75df3379b5fc9293664a5f240"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "ced94ffa3ac020a8f3c14eb98a3bf34acb14d291"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

4.*

4.0.0

4.0.1

4.0.2

4.1.0

4.1.1

4.1.2

4.1.3

4.2.0

4.3.0

4.3.1

4.3.2

4.4.0

4.4.1

4.5.0

4.5.1

4.5.2

4.5.3

4.5.4

4.6.0

4.6.0-alpha1

4.6.1

4.6.2

4.7.0

4.7.1

4.7.2

4.7.3

4.7.4

4.7.5

@socket.*

@socket.io/cluster-adapter@0.3.0

@socket.io/cluster-engine@0.1.0

@socket.io/postgres-emitter@0.1.1

@socket.io/redis-streams-emitter@0.1.0

@socket.io/redis-streams-emitter@0.1.1

engine.*

engine.io-client@6.6.1

engine.io-client@6.6.2

engine.io-client@6.6.3

engine.io-client@6.6.4

engine.io-client@6.6.5

engine.io-client@6.6.6

engine.io-parser@5.2.3

engine.io@6.6.1

engine.io@6.6.2

engine.io@6.6.3

engine.io@6.6.4

engine.io@6.6.5

engine.io@6.6.6

engine.io@6.6.7

engine.io@6.6.8

engine.io@6.6.9

socket.*

socket.io-adapter@2.5.6

socket.io-adapter@2.5.7

socket.io-adapter@2.5.8

socket.io-client@4.8.0

socket.io-client@4.8.1

socket.io-client@4.8.2

socket.io-client@4.8.3

socket.io-parser@3.3.5

socket.io-parser@3.4.4

socket.io-parser@4.2.5

socket.io@4.7.5

socket.io@4.8.0

socket.io@4.8.1

socket.io@4.8.2

socket.io@4.8.3

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-69185.json"