Resource exhaustion in Klever-Io Klever-Go
CVE-2026-86065
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the default-open GET /subscribe endpoint in network/api/websocket/routes.go accepts unauthenticated WebSocket clients with permissive origin handling, does not call SetReadLimit to bound message size, and has no live-connection cap. SocketHub.HandleClientInsertion also accepts an unbounded address list that grows addressSubscription, and client.loopIn continues reading without a size limit, allowing one client to grow subscription maps or many clients to retain goroutines, buffered channels, and descriptors. The global HTTP request throttler does not count upgraded live WebSocket connections. Because the REST and WebSocket API runs in the node process, memory or scheduler exhaustion can crash the node and interrupt P2P and consensus participation. This issue is fixed in version 1.7.20.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
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
- Klever-Io Klever-Go — versions < 1.7.20
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-86065?
- CVE-2026-86065 is a high-severity vulnerability in Klever-Io Klever-Go, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-09-23.
- How severe is CVE-2026-86065?
- High severity. CVSS v3 base score is 7.5 out of 10.