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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| socketio | socket.io | affected |
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Project Subscriptions
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Advisories
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Fixes
Solution
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Workaround
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References
History
Wed, 08 Jul 2026 15:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Socket.IO: Engine.IO WebTransport SID DoS | |
| Weaknesses | CWE-20 | |
| References |
| |
| Metrics |
cvssV3_1
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Projects
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-08T15:35:39.813Z
Reserved: 2026-07-06T15:34:16.916Z
Link: CVE-2026-59724
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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Weaknesses