CVE-2026-86065

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductGithub.com/klever-io/klever-go

PublishedSep 23, 2026

First seenSep 23, 2026

Weakness typeCWE-770Allocation of resources without limits

How to fix

Update

github.com/klever-io/klever-go1.7.20 or later

Affected products

Product	Affected versions	Fixed in
github.com/klever-io/klever-goGo	v < 1.7.20	1.7.20

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