{"id":"CVE-2026-52878","revision":"52aa434b069b4773a02426c56afe5c3a","records":[{"revision":"52aa434b069b4773a02426c56afe5c3a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-52878","aliases":[],"title":"Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chain","description":"Klever-Go is the Go implementation of the Klever blockchain protocol. Versions 1.7.14 through 1.7.17 are vulnerable to a nil-pointer panic triggered by a protobuf Transaction whose embedded RawData sub-message is omitted. This omission causes RawData to decode to nil. Every transaction gossiped on the Klever-Go P2P network is decoded and validated synchronously inside the libp2p pubsub topic-validator callback, where txVersionChecker.CheckTxVersion dereferences tx.RawData.Version with no nil check. Because the libp2p pubsub callback, the underlying go-libp2p-pubsub validation worker, and Klever's own network/p2p layer install no recover(), the panic propagates and crashes the entire node process. The attacker payload is a 3-byte protobuf message; no validator key, stake, funds, or on-chain account is required, and delivery aimed at enough of the BLS validator set can halt block production, resulting in a chain halt. This issue has been fixed in version 1.7.18.","state":0,"publishedAt":"2026-08-07T22:32:27.34+00:00","modifiedAt":"2026-08-10T14:16:48.518+00:00","affected":[{"ecosystem":"Vendor product","name":"klever-go","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"klever-io\",\n                    \"product\": \"klever-go\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.7.14, < 1.7.18\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/klever-io/klever-go/security/advisories/GHSA-rm5c-5x2p-48wr","https://github.com/klever-io/klever-go/releases/tag/v1.7.18"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52878","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-52878","identifiers":["CVE-2026-52878"]},"retained":false,"historicalAffected":[]}],"coverage":[]}