CVE-2023-32695 — socket

socket.io parser is a socket.io encoder and decoder written in JavaScript complying with version 5 of socket.io-protocol. A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process. A patch has been released in

01What is this vulnerability?

socket.io parser is a socket.io encoder and decoder written in JavaScript complying with version 5 of socket.io-protocol. A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process. A patch has been released in version 4.2.3.

02Affected products

Vendor	Product	Versions
socketio	socket.io	parser — >= 4.0.0, < 4.2.3, >= 3.4.0, < 3.4.3

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-05-27T15:44:03.235Z
• Last modified: 2025-01-13T21:03:34.130Z

09References

• github.com — https://github.com/socketio/socket.io-parser/security/advisories/GHSA-cqmj-92xf-…
• github.com — https://github.com/socketio/socket.io-parser/commit/2dc3c92622dad113b8676be06f23…
• github.com — https://github.com/socketio/socket.io-parser/commit/3b78117bf6ba7e99d7a5cfc1ba54…
• github.com — https://github.com/socketio/socket.io-parser/releases/tag/4.2.3