High severity7.5OSV Advisory· Published Jul 8, 2026· Updated Jul 13, 2026
CVE-2026-59724
CVE-2026-59724
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
engine.ionpm | >= 6.5.0, < 6.6.7 | 6.6.7 |
Affected products
3[email protected], [email protected], [email protected], …+ 1 more
- (no CPE)range: [email protected], [email protected], [email protected], …
- (no CPE)range: 6.5.0 <= v < 6.6.7
Patches
Vulnerability mechanics
References
5- github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158cnvdPatchWEB
- github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3nvdPatchVendor AdvisoryMitigationWEB
- github.com/advisories/GHSA-gr94-w7qr-f4j3ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-59724ghsaADVISORY
- github.com/socketio/socket.io/releases/tag/[email protected]nvdRelease NotesWEB
News mentions
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