CVE-2026-52879: Klever-Io Klever-Go

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Klever-Io Klever-Go: from 1.7.14, before 1.7.18 (fixed in 1.7.18)

Published 2026-08-07. Last modified 2026-09-09.