CVE-2026-84197 Security feature bypass in Eclipse Ditto
The Node.js client disables TLS certificate validation, allowing attackers to intercept connections and read or modify Ditto Protocol messages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84197?
CVE-2026-84197 is a critical vulnerability in Eclipse Ditto, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Eclipse Ditto's Node.js JavaScript client, all released versions of @eclipse-ditto/ditto-javascript-client-node from 2.0.0 to 3.9.0 and of its predecessor package @eclipse-ditto/ditto-javascript-client-node_1.0 from 1.0.0 to 2.1.0, the WebSocket transport hard-codes rejectUnauthorized: false when creating the underlying ws WebSocket. Certificate chain and hostname validation are therefore disabled for every wss:// connection, and no builder option, constructor argument or environment variable lets an application turn validation back on. An attacker in a position to intercept the connection can present an arbitrary certificate, complete the TLS handshake, read the credentials that the configured authentication provider sends in the Authorization header of the WebSocket upgrade request, and read, alter or inject Ditto Protocol messages for the lifetime of the connection. The Java client, the browser/DOM JavaScript client and the HTTP transport of the Node.js client are not affected.
Which versions are affected by CVE-2026-84197?
How do I fix CVE-2026-84197?
No fix has been published for CVE-2026-84197 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-84197 being exploited?
There is no known exploitation of CVE-2026-84197 in the wild and no public exploit code.
Sources
Also known as GHSA-j7r5-6vmc-cmcc.