{"id":"CVE-2026-52879","aliases":["GHSA-hf2g-6j7h-98wg","GO-2026-5424"],"url":"https://o3.security/vulnerability/CVE-2026-52879","summary":"Klever-Go: Unbounded goroutine spawn on direct-message ingress enables peer-driven DoS","details":"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.","published":"2026-08-07T22:36:53.980Z","modified":"2026-08-12T03:51:41.526247963Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00294,"percentile":0.22096,"asOf":"2026-08-20"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/klever-io/klever-go","fixedVersion":"1.7.18"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/klever-io/klever-go/releases/tag/v1.7.18"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52879.json"},{"type":"ADVISORY","url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-hf2g-6j7h-98wg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52879"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:41.526247963Z"}}