CVE-2023-32695
HIGHCVE-2023-32695 is a high-severity (CVSS 7.3) Improper Input Validation vulnerability in socket.io-parser. O3 Security confirms whether CVE-2023-32695 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Insufficient validation when decoding a Socket.IO packet
Blast Radius
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
socket.io-parsernpmDescription
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | socket.io-parser | ≥ 4.0.4&&< 4.2.3 | 4.2.3 |
| 📦npm | socket.io-parser | ≥ 3.4.0&&< 3.4.3 | 3.4.3 |
| 📦npm | socket.io-parser | all versions | 3.3.4 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for socket.io-parser. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update socket.io-parser to 4.2.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-32695 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2023-32695 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2023-32695. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2023-32695 in your dependencies?
O3 detects CVE-2023-32695 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.