{"id":"CVE-2026-52878","state":"PUBLISHED","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.","publishedAt":"2026-08-07T22:32:27.340Z","updatedAt":"2026-08-10T14:16:48.518Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["klever-io klever-go"],"affected":[{"vendor":"klever-io","product":"klever-go","versions":[{"version":">= 1.7.14, < 1.7.18","status":"affected"}]}],"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"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/52xxx/CVE-2026-52878.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52878","state":"PUBLISHED","datePublished":"2026-08-07T22:32:27.340Z","dateUpdated":"2026-08-10T14:16:48.518Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-08T21:44:27.364Z"},"containers":{"cna":{"title":"Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chain","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"klever-io","product":"klever-go","versions":[{"version":">= 1.7.14, < 1.7.18","status":"affected"}]}],"references":[{"url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-rm5c-5x2p-48wr","name":"https://github.com/klever-io/klever-go/security/advisories/GHSA-rm5c-5x2p-48wr","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/klever-io/klever-go/releases/tag/v1.7.18","name":"https://github.com/klever-io/klever-go/releases/tag/v1.7.18","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"CWE-476: NULL Pointer Dereference","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-07T22:32:27.340Z"},"source":{"advisory":"GHSA-rm5c-5x2p-48wr","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-rm5c-5x2p-48wr","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-10T14:09:10.957245Z","id":"CVE-2026-52878","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-10T14:16:48.518Z"}}]}}}