CVE-2026-55764 - Klever-Go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply

CVE-2026-55764 - Klever-Go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply

https://cvefeed.io/rssfeed/latest.atom / Sat, 08/29/2026 - 04:29
CVE ID :CVE-2026-55764
Published : Aug. 28, 2026, 11:17 p.m. | 1 hour, 13 minutes ago
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.
Severity: 8.7 | HIGH
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