Klever-IO Klever-Go up to 1.7.18 Semi-Fungible Token Add Quantity systemAcount.go SFTAddCirculation integer overflow

Summaryinfo

A vulnerability classified as problematic was found in Klever-IO Klever-Go up to 1.7.18. Affected is the function SFTAddCirculation of the file core/kapp/systemAccount/systemAcount.go of the component Semi-Fungible Token Add Quantity. Such manipulation leads to integer overflow. This vulnerability is documented as CVE-2026-55764. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Klever-IO Klever-Go up to 1.7.18. Affected by this issue is the function SFTAddCirculation of the file core/kapp/systemAccount/systemAcount.go of the component Semi-Fungible Token Add Quantity. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-55764 since 06/17/2026. The exploitation is known to be easy. The attack may be launched remotely. The exploitation needs additional levels of successful authentication. There are known technical details, but no exploit is available.

Upgrading to version 1.7.19 eliminates this vulnerability.

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Productinfo

Vendor

• Klever-IO

Name

• Klever-Go

Version

• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 1.7.4
• 1.7.5
• 1.7.6
• 1.7.7
• 1.7.8
• 1.7.9
• 1.7.10
• 1.7.11
• 1.7.12
• 1.7.13
• 1.7.14
• 1.7.15
• 1.7.16
• 1.7.17
• 1.7.18

Website

• Product: https://github.com/klever-io/klever-go/

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