CVE-2023-31125
mediumpriority · track · 26EPSS 0.013 · 71 %ileDEEUUSEPSS · scored 2026-10-28
Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. An uncaught exception vulnerability was introduced in version 5.1.0 and included in version 4.1.0 of the `socket.io` parent package. Older versions are not impacted. A specially crafted HTTP request can trigger an uncaught exception on the Engine.IO server, thus killing the Node.js process. This impacts all the users of the `engine.io` package, including those who use depending packages like `socket.io`. This issue was fixed in version 6.4.2 of Engine.IO. There is no known workaround except upgrading to a safe version.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (5)
Products and version ranges known to be affected.
advisories (3)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2023-1800HCL BigFix: Mehrere SchwachstellenDeutsch2023-07-18csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in HCL BigFix WebUI ausnutzen, um seine Privilegien zu erweitern, Dateien zu manipulieren, Informationen offenzulegen, Sicherheitsvorkehrungen zu umgehen oder einen Denial of Service Zustand herbeizuführen.
- WID-SEC-W-2026-0180Dell Data Protection Advisor: Mehrere SchwachstellenDeutsch2026-01-20csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Dell Data Protection Advisor ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand zu erzeugen, Sicherheitsmaßnahmen zu umgehen und nicht näher spezifizierte Angriffe zu starten.
- GHSA-q9mw-68c2-j6m5engine.io Uncaught Exception vulnerability2023-05-03ghsa · osvUS
### Impact A specially crafted HTTP request can trigger an uncaught exception on the Engine.IO server, thus killing the Node.js process. ``` TypeError: Cannot read properties of undefined (reading 'handlesUpgrades') at Server.onWebSocket (build/server.js:515:67) ``` This impacts all the users of the [`engine.io`](https://www.npmjs.com/package/engine.io) package, including those who uses depending packages like [`socket.io`](https://www.npmjs.com/package/socket.io). ### Patches A fix has been released today (2023/05/02): [6.4.2](https://github.com/socketio/engine.io/releases/tag/6.4.2) This bug was introduced in version 5.1.0 and included in version 4.1.0 of the `socket.io` parent package. Older versions are not impacted. For `socket.io` users: | Version range | `engine.io` version | Needs minor update? | |-----------------------------|---------------------|--------------------------------------------------------------------------------------------------------| | `socket.io@4.6.x` | `~6.4.0` | `npm audit fix` should be sufficient | | `socket.io@4.5.x` | `~6.2.0` | Please upgrade to `socket.io@4.6.x` | | `socket.io@4.4.x` | `~6.1.0` | Please upgrade to `socket.io@4.6.x` | | `socket.io@4.3.x` | `~6.0.0` | Please upgrade to `socket.io@4.6.x` | | `socket.io@4.2.x` | `~5.2.0` | Please upgrade to `socket.io@4.6.x` | | `socket.io@4.1.x` | `~5.1.1` | Please upgrade to `socket.io@4.6.x` | | `socket.io@4.0.x` | `~5.0.0` | Not impacted | | `socket.io@3.1.x` | `~4.1.0` | Not impacted | | `socket.io@3.0.x` | `~4.0.0` | Not impacted | | `socket.io@2.5.0` | `~3.6.0` | Not impacted | | `socket.io@2.4.x` and below | `~3.5.0` | Not impacted | ### Workarounds There is no known workaround except upgrading to a safe version. ### For more information If you have any questions or comments about this advisory: * Open an issue in [`engine.io`](https://github.com/socketio/engine.io) Thanks to Thomas Rinsma from Codean for the responsible disclosure.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (13)
External citations — patches, advisories, analysis.
- https://cxsecurity.com/cveshow/CVE-2023-31125/cnnvd
- https://github.com/socketio/engine.io/commit/fc480b4f305e16fe5972cf337d055e598372dc44cnnvd
- https://github.com/socketio/engine.io/releases/tag/6.4.2cnnvd
- https://github.com/socketio/engine.io/security/advisories/GHSA-q9mw-68c2-j6m5cnnvd
- https://security.netapp.com/advisory/ntap-20230622-0002/cnnvd
- https://github.com/socketio/engine.io/commit/fc480b4f305e16fe5972cf337d055e598372dc44enisa_euvd
- https://github.com/socketio/engine.io/releases/tag/6.4.2enisa_euvd
- https://github.com/socketio/engine.io/security/advisories/GHSA-q9mw-68c2-j6m5enisa_euvd
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