TI-2026-37978 Aliases CVE-2026-52879 GHSA-hf2g-6j7h-98wg

Klever-Go: Unbounded goroutine spawn on direct-message ingress enables peer-driven DoS

HIGH 72CWE-400Published 2026-08-07 · Updated 2026-08-10

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-400.

Summary

Klever-Go is the Go implementation of the Klever blockchain protocol. In versions 1.7.14 through 1.7.17, the direct-message ingress handler spawns a new goroutine for every incoming direct message before the processor-level antiflood layer makes any admission decision, with no semaphore, throttler, or bound on the number of concurrent in-flight spawns. Because the antiflood check runs inside the spawned goroutine rather than before it, a single connected peer can open a direct-send stream and send a stream of well-formed messages to force unbounded goroutine creation, where each goroutine allocates its own stack and holds a message reference until processing completes, adding scheduler and garbage-collection pressure faster than the runtime can drain it. This lets one peer degrade the node's availability and its ability to process legitimate traffic, resulting in a remotely triggerable denial of service. The issue is fixed in 1.7.18.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00488 42nd percentileScored 2026-11-07

Fix Fixed klever-go (klever-io): 1.7.18github.com/klever-io/klever-go (Go): 1.7.18

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	1.7.14 to before 1.7.18	1.7.18	Patch available	CNA
—	github.com/klever-io/klever-go (Go)	1.7.14 to before 1.7.18	1.7.18	Patch available	GHSA-hf2g-6j7h-98wg

klever-go Vendorklever-io Affected 1.7.14 to before 1.7.18 Fixed in 1.7.18 Patch available CNA
github.com/klever-io/klever-go (Go) Vendor— Affected 1.7.14 to before 1.7.18 Fixed in 1.7.18 Patch available GHSA-hf2g-6j7h-98wg

Remediation

Fix · CNA klever-go (klever-io) Fixed in 1.7.18
Fix · GHSA-hf2g-6j7h-98wg github.com/klever-io/klever-go (Go) Fixed in 1.7.18 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-52879
2026-10-03 Alias added: GHSA-hf2g-6j7h-98wg

References

Other 3

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-2026-58875 Resource allocation without limits in klever-io klever-go CVSS 3.1HIGH 7.5

See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences