{"id":"CVE-2026-55764","title":"Klever-Go is the Go implementation of the Klever blockchain protocol","summary":"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/sy…","severity":"high","cwe":["CWE-190"],"vendor":"klever-io","product":"github.com/klever-io/klever-go","affected":["github.com/klever-io/klever-go < 1.7.19"],"patched":["github.com/klever-io/klever-go 1.7.19"],"published":"2026-08-28","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:09:13.080","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55764","references":[{"url":"https://github.com/klever-io/klever-go/commit/8bcc600b0ac88070740c63c7ce1c8a968dd85251","label":"security-advisories@github.com"},{"url":"https://github.com/klever-io/klever-go/releases/tag/v1.7.19","label":"security-advisories@github.com"},{"url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-mrpp-v6pg-p54x","label":"security-advisories@github.com"},{"url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-mrpp-v6pg-p54x","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-mrpp-v6pg-p54x"}],"tags":["nvd","ghsa","go"],"epss":0.00323,"epssPercentile":0.25602,"aliases":["GHSA-mrpp-v6pg-p54x"],"ecosystem":"go","ingestedAt":"2026-08-28T22:26:19.120Z","slug":"CVE-2026-55764","body":"## Overview\n\nKlever-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55764)\n\nAffected packages:\n\n- `github.com/klever-io/klever-go < 1.7.19`\n\nPatched in:\n\n- `github.com/klever-io/klever-go 1.7.19`\n\nSource: https://github.com/advisories/GHSA-mrpp-v6pg-p54x","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}