# CVE-2023-32695: Socket.IO Parser insufficient input validation denial of service

Source: https://junglewise.ai/threats/cve-2023-32695-socket-io-parser-insufficient-input-validation-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-05-23. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2023-32695 · Severity: low · CVSS 3.1 · Published 2023-05-23

Socket.IO Parser is a JavaScript library that handles real-time bidirectional communication packets for Node.js applications. A malformed Socket.IO packet can cause an uncaught exception that crashes the entire Node.js process, resulting in service outage and potential data loss for connected clients.

Technologies: [socket.io-parser (npm)](https://junglewise.ai/threats/technologies/socket-io-parser). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2023-32695 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-32695 being exploited in the wild.

**How severe is CVE-2023-32695?** Low severity, with a CVSS score of 3.1, published 23 May 2023.

**Which products and versions are affected?** socket.io-parser (npm) SEMVER:introduced=4.0.4,fixed=4.2.3.

**Is there a fix for CVE-2023-32695?** Yes. socket.io-parser (npm): upgrade to 4.2.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2023-32695 attacked?** It is attacked over the network.

**Am I affected by CVE-2023-32695?** Check whether you run socket.io-parser (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- socket.io-parser (npm): upgrade to 4.2.3 or later

  ```sh
  npm install socket.io-parser@4.2.3
  ```


## Technical details

A specially crafted Socket.IO packet fails validation during decoding and triggers a TypeError ("Cannot convert object to primitive value") in the Socket.IO event emitter, causing an uncaught exception that terminates the Node.js process. The vulnerability exists in socket.io-parser versions 4.0.4–4.2.2, 3.4.0–3.4.2, and all earlier versions prior to 3.3.4. No authentication or special privileges are required; an attacker on the network can send a malicious packet directly to the server. Patches were released on 2023-05-22 in socket.io-parser 4.2.3, 3.4.3, and 3.3.4.

## Affected products

- Socket.IO socket.io-parser 4.0.4–4.2.2, 3.4.0–3.4.2, and prior versions before 3.3.4

## Identifiers

- CVE-2023-32695
- GHSA-cqmj-92xf-r6r9

## Timeline

- 2023-05-22: disclosed: Advisory published and patches released
- 2023-05-22: patched: Fixes in socket.io-parser 4.2.3, 3.4.3, and 3.3.4

## References

- [https://github.com/socketio/socket.io-parser/security/advisories/GHSA-cqmj-92xf-r6r9](https://github.com/socketio/socket.io-parser/security/advisories/GHSA-cqmj-92xf-r6r9)

## Related threats

- [Socket.IO Parser improper type validation in packet decoding](https://junglewise.ai/threats/cve-2022-2421-socket-io-parser-improper-type-validation-in-packet-decoding)
- [socket.io-parser resource exhaustion via packet processing](https://junglewise.ai/threats/cve-2020-36049-socket-io-parser-resource-exhaustion-via-packet-processing)