CVE-2026-108748 Quarkus LangChain4j 1.9.0 through 1.14.1 Memory Exhaustion via /_chat/routes WebSocket
Unauthenticated attackers can exhaust server memory via WebSocket connections, causing denial of service in Quarkus LangChain4j applications.
- 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-2026-108748?
CVE-2026-108748 is a medium-severity denial of service vulnerability in quarkiverse quarkus-langchain4j, published on 11 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Quarkus LangChain4j 1.9.0 through 1.14.1 contains a missing release of memory vulnerability in the chat-scopes WebSocket /_chat/routes endpoint that allows unauthenticated remote clients to exhaust server memory. Attackers can send repeated CONNECT frames reusing one chatId, leaving orphaned scopes in activeScopes until the JVM exits and degrading availability.
Weakness: CWE-401
Which versions are affected by CVE-2026-108748?
How do I fix CVE-2026-108748?
No fix has been published for CVE-2026-108748 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-108748 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108748 exists.
Sources
Also known as GHSA-crp7-w5m5-rwj8.