Vulnerability in Quarkiverse Quarkus-Langchain4j
CVE-2026-108748
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind/quarkus-langchain4j-chatscope-orphan-leak (third-party-advisory)
- github.com/quarkiverse/quarkus-langchain4j/blob/658ac8268e1a453a6a2066952d9495f… (technical-description)
- github.com/quarkiverse/quarkus-langchain4j/blob/658ac8268e1a453a6a2066952d9495f… (technical-description)
- github.com/quarkiverse/quarkus-langchain4j (product)
- www.vulncheck.com/advisories/quarkus-langchain4j-1.9.0-through-1.14.1-memory-ex… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-108748?
- CVE-2026-108748 is a medium-severity vulnerability in Quarkiverse Quarkus-Langchain4j, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.3/10. Published 2026-10-11.
- How severe is CVE-2026-108748?
- Medium severity. CVSS v3 base score is 5.3 out of 10.