{"id":"CVE-2026-58262","summary":"Klever-Go: PubKeysBitmap padding bits bypass the BLS signature quorum","details":"Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, header signature verification counts the unused padding bits of the PubKeysBitmap toward the two-thirds validator quorum. These padding bits do not correspond to any validator and are ignored by the actual BLS aggregate-signature check, so a malicious or compromised block producer can set them to reach the required quorum while gathering fewer genuine validator signatures than the protocol demands. As a result, nodes that import or intercept the header accept it as correctly signed without a real two-thirds quorum, weakening consensus safety and undermining finality. This issue is fixed in version 1.7.20.","aliases":["GHSA-f9h7-4mmq-vgcq"],"modified":"2026-08-09T03:47:21.821797146Z","published":"2026-08-07T22:00:57.154Z","database_specific":{"cwe_ids":["CWE-345","CWE-347"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58262.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58262.json"},{"type":"ADVISORY","url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-f9h7-4mmq-vgcq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58262"},{"type":"FIX","url":"https://github.com/klever-io/klever-go/commit/a11cb28e495e608d8034dbe83a91e89d0c68e0f7"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/klever-io/klever-go","events":[{"introduced":"0"},{"fixed":"a11cb28e495e608d8034dbe83a91e89d0c68e0f7"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"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-2026-58262.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"}]}