CVE-2026-108748
quarkus-langchain4j: Quarkus LangChain4j 1.9.0 through 1.14.1 Memory Exhaustion via /_chat/routes WebSocket
quarkiverse quarkus-langchain4jFrameworks
CVSS
6.9MediumExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 13 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.30%Chance of exploitation activity in the next 30 days, higher than 21% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- quarkus-langchain4jaffected: 1.9.0 through 1.14.1CVE List
References 5
- vulncheck.com/advisories/quarkus-langchain4j-1.9.0-through-1.14.1-memory-exhaustion-via-chat-routes-websocketAdvisoryvia CVE List
- hackmd.io/@haind/quarkus-langchain4j-chatscope-orphan-leakExploitvia CVE List
- github.com/quarkiverse/quarkus-langchain4j/blob/658ac8268e1a453a6a2066952d9495fb925479e3/chat-scopes/websocket/runtime/src/main/java/io/quarkiverse/langchain4j/chatscopes/websocket/internal/ChatRouteEndpoint.java#L122-L160Referencevia CVE List
- github.com/quarkiverse/quarkus-langchain4j/blob/658ac8268e1a453a6a2066952d9495fb925479e3/chat-scopes/core/runtime/src/main/java/io/quarkiverse/langchain4j/chatscopes/internal/ChatScopeManagedContext.java#L297-L311Referencevia CVE List
- github.com/quarkiverse/quarkus-langchain4jReferencevia CVE List