Vulnerability Details CVE-2026-33151
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 27.7%
CVSS Severity
CVSS v3 Score 7.5
References
- https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4
- https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf
- https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78
- https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9
Products affected by CVE-2026-33151
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cpe:2.3:a:socket:socket.io-parser:2.0.0
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cpe:2.3:a:socket:socket.io-parser:2.1.0
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cpe:2.3:a:socket:socket.io-parser:2.1.1
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cpe:2.3:a:socket:socket.io-parser:2.1.2
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cpe:2.3:a:socket:socket.io-parser:2.1.3
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cpe:2.3:a:socket:socket.io-parser:2.1.4
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cpe:2.3:a:socket:socket.io-parser:2.1.5
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cpe:2.3:a:socket:socket.io-parser:2.2.0
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cpe:2.3:a:socket:socket.io-parser:2.2.1
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cpe:2.3:a:socket:socket.io-parser:2.2.2
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cpe:2.3:a:socket:socket.io-parser:2.2.3
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cpe:2.3:a:socket:socket.io-parser:2.2.4
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cpe:2.3:a:socket:socket.io-parser:2.2.5
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cpe:2.3:a:socket:socket.io-parser:2.2.6
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cpe:2.3:a:socket:socket.io-parser:2.3.0
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cpe:2.3:a:socket:socket.io-parser:2.3.1
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cpe:2.3:a:socket:socket.io-parser:2.3.2
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cpe:2.3:a:socket:socket.io-parser:3.0.0
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cpe:2.3:a:socket:socket.io-parser:3.1.0
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cpe:2.3:a:socket:socket.io-parser:3.1.1
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cpe:2.3:a:socket:socket.io-parser:3.1.2
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cpe:2.3:a:socket:socket.io-parser:3.1.3
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cpe:2.3:a:socket:socket.io-parser:3.2.0
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cpe:2.3:a:socket:socket.io-parser:3.3.0
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cpe:2.3:a:socket:socket.io-parser:3.3.1
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cpe:2.3:a:socket:socket.io-parser:3.4.0
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cpe:2.3:a:socket:socket.io-parser:3.4.1
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cpe:2.3:a:socket:socket.io-parser:3.4.2
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cpe:2.3:a:socket:socket.io-parser:3.4.3
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cpe:2.3:a:socket:socket.io-parser:4.0.0
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cpe:2.3:a:socket:socket.io-parser:4.0.1
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cpe:2.3:a:socket:socket.io-parser:4.0.2
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cpe:2.3:a:socket:socket.io-parser:4.0.3
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cpe:2.3:a:socket:socket.io-parser:4.0.4
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cpe:2.3:a:socket:socket.io-parser:4.0.5
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cpe:2.3:a:socket:socket.io-parser:4.1.0
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cpe:2.3:a:socket:socket.io-parser:4.1.1
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cpe:2.3:a:socket:socket.io-parser:4.1.2
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cpe:2.3:a:socket:socket.io-parser:4.2.0
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cpe:2.3:a:socket:socket.io-parser:4.2.1
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cpe:2.3:a:socket:socket.io-parser:4.2.2
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cpe:2.3:a:socket:socket.io-parser:4.2.3