CVE-2026-102600 Socket.IO - Prototype Pollution

Socket.IO @socket.io/cluster-engine < 0.1.1 contains a prototype pollution caused by using inherited object properties for session ID lookup, letting attackers crash the Node.js process causing denial of service, exploit requires attacker to send crafted session IDs.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.37% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Prototype Pollution
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-20

Vendor fix

Update to version 0.1.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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