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CVE-2026-86065— Klever-Go: Unauthenticated WebSocket /subscribe: no read-size limit, no connection cap, permissive origin -> remote node memory/goroutine exhaustion (DoS)

Quick assessment

Affected
klever-io klever-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 SetReadL

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
klever-io klever-go < 1.7.20 affected
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I. Basic Information for CVE-2026-86065

Vulnerability Information

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Vulnerability Title
Klever-Go: Unauthenticated WebSocket /subscribe: no read-size limit, no connection cap, permissive origin -> remote node memory/goroutine exhaustion (DoS)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
klever-io klever-go < 1.7.20 -

II. Public POCs for CVE-2026-86065

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III. Intelligence Information for CVE-2026-86065

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Other References for CVE-2026-86065 (3)

Same Patch Batch · klever-io · 2026-09-23 · 6 CVEs total

CVE-2026-82405 8.7 HIGH Klever-Go Account takeover: `kleverUpdateAccountPermission` authorizes on attacker-control
CVE-2026-86064 8.6 HIGH Klever-Go: /log controls global node logging
CVE-2026-82409 8.4 HIGH Klever-Go: Elasticsearch bulk / painless injection via on-chain account name -> explorer/
CVE-2026-82406 7.1 HIGH Klever-Go: Zombie-order theft: `Buy` missing `IsClaimed` guard in native marketplace
CVE-2026-82407 7.0 HIGH Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus livene

IV. Related Vulnerabilities

Same product: klever-go
Same vendor: klever-io
Same weakness: CWE-770

V. Comments for CVE-2026-86065

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