{"id":"CVE-2026-55764","summary":"Klever-Go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply","details":"Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.19, Klever-Go allows a mint-role holder to bypass a finite per-nonce MaxSupply on the semi-fungible token add-quantity path. In core/kapp/systemAccount/systemAcount.go, SFTAddCirculation performed meta.Circulation += amount before evaluating whether Circulation exceeded MaxSupply, without checking for signed int64 overflow. A large positive raw Amount supplied through processSemiFungibleAddQuantity in core/kapp/kda/mint.go can wrap Circulation negative, causing the signed maximum-supply comparison to pass and crediting approximately MaxInt64 units while corrupting the on-chain counter. The fungible path is not affected because its MintedValue \u003c= 0 guard detects the overflow. The correction uses the consensus activation flag FixMarketBuyOverflow. This issue is fixed in version 1.7.19.","aliases":["GHSA-mrpp-v6pg-p54x","GO-2026-6330"],"modified":"2026-09-11T03:30:35.831674240Z","published":"2026-08-28T22:08:27.196Z","related":["openSUSE-SU-2026:21812-1"],"database_specific":{"cwe_ids":["CWE-190"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55764.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/klever-io/klever-go/releases/tag/v1.7.19"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55764.json"},{"type":"ADVISORY","url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-mrpp-v6pg-p54x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55764"},{"type":"FIX","url":"https://github.com/klever-io/klever-go/commit/8bcc600b0ac88070740c63c7ce1c8a968dd85251"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/klever-io/klever-go","events":[{"introduced":"0"},{"fixed":"8bcc600b0ac88070740c63c7ce1c8a968dd85251"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.7.19"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["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-2026-55764.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}