SB20260625160 - Input validation error in socket.io-parser
Published: June 25, 2026
Security Bulletin ID
SB20260625160
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: CVE-2026-33151)
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 the Socket.IO packet parser when processing specially crafted packets with an unbounded number of binary attachments. A remote attacker can send a specially crafted packet to cause a denial of service.
The issue can cause the server to buffer excessive binary attachments until memory is exhausted.
Remediation
Install update from vendor's website.