{"id":"CVE-2026-82407","summary":"Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS","details":"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.","aliases":["GHSA-9wh6-9hq7-9688"],"modified":"2026-09-24T03:46:22.561992556Z","published":"2026-09-23T19:17:59.006Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-20"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82407.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82407.json"},{"type":"FIX","url":"https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff"},{"type":"FIX","url":"https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f"},{"type":"WEB","url":"https://github.com/klever-io/klever-go/releases/tag/v1.7.20"},{"type":"ADVISORY","url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82407"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/klever-io/klever-go","events":[{"introduced":"0"},{"fixed":"0b70b0f1a1f5d95ac07c2038c227db7f18976a2a"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"1.7.20"}]}}],"versions":["v1.7.19","v1.7.18","v1.7.17","v1.7.16","v1.7.15","v1.7.14"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82407.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}