{"cve":"CVE-2026-82407","nvd":{"published":"2026-09-23T20:17:16.707","modified":"2026-09-23T20:17:16.847","status":"Deferred","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.","cvss_v4":{"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","score":7.0},"cvss_v3":null,"cwes":["CWE-20"],"references":["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","https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688","https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-82407","score":0.00466,"percentile":0.40357,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9wh6-9hq7-9688","url":"https://osv.dev/vulnerability/GHSA-9wh6-9hq7-9688","summary":"Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS","modified":"2026-10-01T20:56:13.319048406Z","packages":[{"ecosystem":"Go","name":"github.com/klever-io/klever-go","purl":"pkg:golang/github.com/klever-io/klever-go","ranges":["<1.7.20"],"fixed":["1.7.20"]}]},{"id":"GO-2026-6586","url":"https://osv.dev/vulnerability/GO-2026-6586","summary":"Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS in github.com/klever-io/klever-go","modified":"2026-10-01T20:45:15.883717076Z","packages":[{"ecosystem":"Go","name":"github.com/klever-io/klever-go","purl":"pkg:golang/github.com/klever-io/klever-go","ranges":["<1.7.20"],"fixed":["1.7.20"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}