Resource allocation without limits in klever-io klever-go
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.
Summary
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.
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 |
|---|---|---|---|---|---|
| klever-io | klever-go | before 1.7.20 | 1.7.20 | Patch available | CNA |
| — | github.com/klever-io/klever-go (Go) | before 1.7.20 | 1.7.20 | Patch available | GHSA-4fwh-wrm6-97xm |
- klever-go Vendorklever-io Affected before 1.7.20 Fixed in 1.7.20 Patch available CNA
- github.com/klever-io/klever-go (Go) Vendor— Affected before 1.7.20 Fixed in 1.7.20 Patch available GHSA-4fwh-wrm6-97xm
Remediation
- Fix · CNA klever-go (klever-io) Fixed in 1.7.20
- Fix · GHSA-4fwh-wrm6-97xm github.com/klever-io/klever-go (Go) Fixed in 1.7.20 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-86065
- 2026-10-03 Alias added: GHSA-4fwh-wrm6-97xm
References
Other 5
- https://github.com/klever-io/klever-go/security/advisories/GHSA-4fwh-wrm6-97xm
- https://github.com/klever-io/klever-go/pull/76
- https://github.com/klever-io/klever-go/commit/b8af922e749ec1fa7451b2c6e7c9f634d8603be2
- https://github.com/klever-io/klever-go/releases/tag/v1.7.20
- https://github.com/klever-io/klever-go
More klever-io vulnerabilities
- TI-2026-40253 Klever-Go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply CVSS 4.0HIGH 8.7
- TI-2026-40252 Klever-Go: Percentage-transfer royalty skips the source debit at exactly-100% splits CVSS 4.0HIGH 8.7
- TI-2026-58874 Klever-Go: /log controls global node logging CVSS 3.1HIGH 8.6
- TI-2026-32588 Klever-Go MultiDataInterceptor: remote OOM via crafted compressed P2P payload CVSS 3.1HIGH 8.6
- TI-2026-39560 Integer underflow in klever-io klever-go CVSS 3.1CRITICAL 9.6
- TI-2026-37979 Klever-Go: REST API slow-header connection exhaustion via Gin Engine.Run CVSS 3.1HIGH 7.5
Sources
- CVE-2026-86065 · CVE Program
- CVE-2026-86065 · NVD
- FIRST EPSS
- GHSA-4fwh-wrm6-97xm · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences