Quarkus LangChain4j Memory Exhaustion via /_chat/routes WebSocket
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-401.
Summary
Quarkus LangChain4j 1.9.0 through 1.14.1 contains a missing release of memory vulnerability (CWE-401) in the chat-scopes WebSocket /_chat/routes endpoint. Unauthenticated remote clients can exhaust server memory by sending repeated CONNECT frames that reuse one chatId, which leaves orphaned scopes in activeScopes until the JVM exits. The result is degraded availability. The CVSS 4.0 base score is 6.9 (MEDIUM), and CISA SSVC lists exploitation as poc, with no entry in KEV.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| quarkiverse | quarkus-langchain4j | 1.9.0 – 1.14.1 | — | No fix listed | CNA |
- quarkus-langchain4j Vendorquarkiverse Affected 1.9.0 – 1.14.1 Fixed in — No fix listed CNA
Remediation
No fixed version is listed for quarkiverse quarkus-langchain4j. Red Hat lists one product as not affected. Until a fix is available, restrict access to the /_chat/routes WebSocket endpoint and monitor memory use on affected servers.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Vendor assessments
Timeline
- 2026-10-11 Threatist record created from CVE-2026-108748
- 2026-10-11 Alias added: GHSA-crp7-w5m5-rwj8
- 2026-10-12 Priority changed: MEDIUM → LOW
- 2026-10-13 CISA SSVC decision points changed
- 2026-10-13 Priority changed: LOW → HIGH
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 CVSS score added · Red Hat
References
Other 3
- https://github.com/quarkiverse/quarkus-langchain4j/blob/658ac8268e1a453a6a2066952d9495fb925479e3/chat-scopes/websocket/runtime/src/main/java/io/quarkiverse/langchain4j/chatscopes/websocket/internal/ChatRouteEndpoint.java#L122-L160
- https://github.com/quarkiverse/quarkus-langchain4j/blob/658ac8268e1a453a6a2066952d9495fb925479e3/chat-scopes/core/runtime/src/main/java/io/quarkiverse/langchain4j/chatscopes/internal/ChatScopeManagedContext.java#L297-L311
- https://github.com/quarkiverse/quarkus-langchain4j
More quarkiverse vulnerabilities
- TI-2026-28994 Zip Slip Path Traversal in quarkus-openapi-generator ApicurioCodegenWrapper class CVSS 4.0HIGH 7.7
- TI-2026-30637 Information disclosure in quarkiverse quarkus-openapi-generator CVSS 4.0MEDIUM 6.3
Sources
- CVE-2026-108748 · CVE Program
- CVE-2026-108748 · NVD
- FIRST EPSS
- GHSA-crp7-w5m5-rwj8 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-108748 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences