Klever-IO Klever-Go up to 1.7.19 WebSocket API routes.go SocketHub.HandleClientInsertion allocation of resources

Summaryinfo

A vulnerability marked as problematic has been reported in Klever-IO Klever-Go up to 1.7.19. Affected by this vulnerability is the function SocketHub.HandleClientInsertion of the file network/api/websocket/routes.go of the component WebSocket API. This manipulation causes allocation of resources. The identification of this vulnerability is CVE-2026-86065. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Klever-IO Klever-Go up to 1.7.19 and classified as problematic. Affected by this vulnerability is the function SocketHub.HandleClientInsertion of the file network/api/websocket/routes.go of the component WebSocket API. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-86065 since 09/04/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 1.7.20 eliminates this vulnerability.

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Productinfo

Vendor

• Klever-IO

Name

• Klever-Go

Version

• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 1.7.4
• 1.7.5
• 1.7.6
• 1.7.7
• 1.7.8
• 1.7.9
• 1.7.10
• 1.7.11
• 1.7.12
• 1.7.13
• 1.7.14
• 1.7.15
• 1.7.16
• 1.7.17
• 1.7.18
• 1.7.19

Website

• Product: https://github.com/klever-io/klever-go/

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