{"id":"CVE-2026-82407","state":"PUBLISHED","title":"Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS","description":"Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, core/kapp/validators/validators.go Register and the runtime validator update path accept a submitted BLSPublicKey without curve, prime-order subgroup, or nonzero validation. When a validator with a malformed key becomes eligible and is selected into a consensus group, MultiSigner.Reset and the corresponding signature verification creation path cannot deserialize the group key and cancel the slot. This causes repeated missed rounds and throughput degradation, and a network whose consensus group equals the eligible validator set can halt completely. Genesis validation is not affected because that path already performs CheckPublicKeyValid. This issue is fixed in version 1.7.20.","publishedAt":"2026-09-23T19:17:59.006Z","updatedAt":"2026-09-23T19:42:17.556Z","severity":{"score":7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["klever-io klever-go"],"affected":[{"vendor":"klever-io","product":"klever-go","versions":[{"version":"< 1.7.20","status":"affected"}]}],"references":["https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688","https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff","https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f","https://github.com/klever-io/klever-go/releases/tag/v1.7.20"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/82xxx/CVE-2026-82407.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-82407","state":"PUBLISHED","datePublished":"2026-09-23T19:17:59.006Z","dateUpdated":"2026-09-23T19:42:17.556Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-28T22:00:43.513Z"},"containers":{"cna":{"title":"Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS","descriptions":[{"lang":"en","value":"Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, core/kapp/validators/validators.go Register and the runtime validator update path accept a submitted BLSPublicKey without curve, prime-order subgroup, or nonzero validation. When a validator with a malformed key becomes eligible and is selected into a consensus group, MultiSigner.Reset and the corresponding signature verification creation path cannot deserialize the group key and cancel the slot. This causes repeated missed rounds and throughput degradation, and a network whose consensus group equals the eligible validator set can halt completely. Genesis validation is not affected because that path already performs CheckPublicKeyValid. This issue is fixed in version 1.7.20."}],"affected":[{"vendor":"klever-io","product":"klever-go","versions":[{"version":"< 1.7.20","status":"affected"}]}],"references":[{"url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688","name":"https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff","name":"https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff","tags":["x_refsource_MISC"]},{"url":"https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f","name":"https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f","tags":["x_refsource_MISC"]},{"url":"https://github.com/klever-io/klever-go/releases/tag/v1.7.20","name":"https://github.com/klever-io/klever-go/releases/tag/v1.7.20","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"HIGH","baseScore":7,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20: Improper Input Validation","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-23T19:17:59.006Z"},"source":{"advisory":"GHSA-9wh6-9hq7-9688","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-23T19:41:57.322149Z","id":"CVE-2026-82407","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-23T19:42:17.556Z"}}]}}}