{"cve":"CVE-2026-55764","nvd":{"published":"2026-08-28T23:17:07.220","modified":"2026-09-09T21:09:13.080","status":"Deferred","description":"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 <= 0 guard detects the overflow. The correction uses the consensus activation flag FixMarketBuyOverflow. This issue is fixed in version 1.7.19.","cvss_v4":{"vector":"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","score":8.7},"cvss_v3":null,"cwes":["CWE-190"],"references":["https://github.com/klever-io/klever-go/commit/8bcc600b0ac88070740c63c7ce1c8a968dd85251","https://github.com/klever-io/klever-go/releases/tag/v1.7.19","https://github.com/klever-io/klever-go/security/advisories/GHSA-mrpp-v6pg-p54x","https://github.com/klever-io/klever-go/security/advisories/GHSA-mrpp-v6pg-p54x"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-55764","score":0.00538,"percentile":0.45307,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mrpp-v6pg-p54x","url":"https://osv.dev/vulnerability/GHSA-mrpp-v6pg-p54x","summary":"klever-go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply","modified":"2026-09-02T19:55:38.987330614Z","packages":[{"ecosystem":"Go","name":"github.com/klever-io/klever-go","purl":"pkg:golang/github.com/klever-io/klever-go","ranges":["<1.7.19"],"fixed":["1.7.19"]}]},{"id":"GO-2026-6330","url":"https://osv.dev/vulnerability/GO-2026-6330","summary":"klever-go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply in github.com/klever-io/klever-go","modified":"2026-09-02T19:45:12.642737946Z","packages":[{"ecosystem":"Go","name":"github.com/klever-io/klever-go","purl":"pkg:golang/github.com/klever-io/klever-go","ranges":["<1.7.19"],"fixed":["1.7.19"]}]}],"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."]}