CVE-2026-33151
HIGH WAF: Medium
CVSS 7.5
Published: 2026-03-20
CWE-20
Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. Prior to versions 3.3.5, 3.4.4, and 4.2.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This issue has been patched in versions 3.3.5, 3.4.4, and 4.2.6.
WAF Coverage Analysis
Improper Input Validation
Medium WAF Coverage
OWASP: A03:2021 Injection
920xxx - Protocol Enforcement 941xxx - XSS / XXE 942xxx - SQL Injection
Affected Software
| Vendor | Product | Version |
|---|---|---|
| socket | socket.io-parser | up to 3.3.5 |
| socket | socket.io-parser | 3.4.0 - 3.4.4 |
| socket | socket.io-parser | 4.0.0 - 4.2.6 |
References
- github.com (Patch)
- github.com (Patch)
- github.com (Patch)
- github.com (Patch, Vendor Advisory)