# CVE-2026-33151: node-socket.io-parser: Socket.IO is an open source, real-time, bidirectional, event-based, communication framework

CVE-2026-33151 is fixed in node-socket.io-parser on 1 platform by DEBIAN-CVE-2026-33151 (version 4.2.1+~3.1.0-4), released March 20, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-33151
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0054
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 20, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-socket.io-parser Debian 14 | 4.2.1+~3.1.0-4 | [DEBIAN-CVE-2026-33151](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33151.md) | Mar 20, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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