CVE-2024-38355: high-severity vulnerability in socketio socket.io
Unhandled 'error' event in socket.io
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.3epss 0.8%
Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process. This issue is fixed by commit `15af22fc22` which has been included in `socket.io@4.6.2` (released in May 2023). The fix was backported in the 2.x branch as well with commit `d30630ba10`. Users are advised to upgrade. Users unable to upgrade may attach a listener for the "error" event to catch these errors.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Affected products
socketio · socket.ioRelated CVEs — socketio socket.io
In the same product, most dangerous first.
CVE-2026-69185HIGHSocket.IO: Zero-attachment Memory ExhaustionEPSS 0.6%CVE-2026-59724HIGHSocket.IO: Engine.IO WebTransport SID DoSEPSS 0.6%CVE-2026-102599HIGHSocket.IO: Engine.IO Protocol Revision Mismatch DoSEPSS 0.6%CVE-2026-33151HIGHsocket.io allows an unbounded number of binary attachmentsEPSS 0.5%CVE-2026-102600HIGHSocket.IO: Prototype Pollution via Unsafe Client Session LookupEPSS 0.4%
References
https://github.com/socketio/socket.io/commit/15af22fc22bc6030fcead322c106f07640336115https://github.com/socketio/socket.io/commit/d30630ba10562bf987f4d2b42440fc41a828119chttps://github.com/socketio/socket.io/security/advisories/GHSA-25hc-qcg6-38wjhttps://www.vicarius.io/vsociety/posts/unhandled-exception-in-socketio-cve-2024-38355