{"schemaVersion":3,"id":"CVE-2026-52878","aliases":["GHSA-rm5c-5x2p-48wr","GO-2026-5628"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-08-07T22:32:27.340Z","modified":"2026-08-10T14:16:48.518Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Go","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","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","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","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00488,"percentile":0.40981,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.15099999999999997,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00337},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00488,"percentile":0.40981}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00337,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00488,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00488,"percentile":0.40981}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-476","name":"NULL Pointer Dereference","description":"The product dereferences a pointer that it expects to be valid but is NULL.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/476.html"}],"affected":[{"vendor":"github.com/klever-io","product":"klever-go","name":"github.com/klever-io/klever-go","label":"klever-go","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/klever-io/klever-go","purlType":"golang","versions":[{"text":"≥ 1.7.14, < 1.7.18","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.7.14, < 1.7.18","eol":null,"hubHref":null},{"vendor":"klever-io","product":"klever-go","name":"klever-go","label":"klever-go","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.7.14, < 1.7.18","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.7.14, < 1.7.18","eol":null,"hubHref":"/vendor/klever-io/klever-go"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-rm5c-5x2p-48wr","label":"github.com/klever-io/klever-go/security/advisories/GHSA-rm5c-5x2p-48wr","hostname":"github.com","tags":["X Refsource CONFIRM","WEB","Advisory"]},{"url":"https://github.com/klever-io/klever-go/releases/tag/v1.7.18","label":"github.com/klever-io/klever-go/releases/tag/v1.7.18","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/klever-io/klever-go","label":"github.com/klever-io/klever-go","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:21483-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:21483-1"]},"timeline":[{"kind":"published","date":"2026-08-07T22:32:27.340Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-10T14:16:48.518Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T11:34:19.952Z","stale":false,"partial":false}}