SB20260625161 - Multiple vulnerabilities in socket.io

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Main Vulnerability Database SB20260625161

SB20260625161 - Multiple vulnerabilities in socket.io

Published: June 25, 2026

Security Bulletin ID SB20260625161
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Improper Resource Shutdown or Release (CVE-ID: N/A)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper resource shutdown or release in the Engine.IO polling transport when handling invalid binary POST requests for Engine.IO protocol v4. A remote attacker can open polling sessions and send a specially crafted request to cause a denial of service.

The issue occurs when the server reports a transport error but does not properly close the HTTP response, which can leave the underlying connection open and consume server-side sockets or file descriptors.


2) Input validation error (CVE-ID: N/A)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in WebTransport upgrade handling when processing a crafted WebTransport upgrade request with a chosen session ID. A remote attacker can send a specially crafted WebTransport upgrade request to cause a denial of service.

Only deployments with WebTransport support enabled are vulnerable. WebTransport is not enabled by default.


Remediation

Install update from vendor's website.

References