Klever-Go
CVE-2026-55764
HIGH
GHSA-mrpp-v6pg-p54x
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Mint-role is an explicit on-chain grant (PR:L); integrity impact is high due to unauthorized token minting and counter corruption; availability impact is low as service continues operating.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Integer overflow in Klever-Go's semi-fungible token (SFT) add-quantity path prior to version 1.7.19 allows a mint-role holder to bypass a finite per-nonce MaxSupply constraint, minting approximately 9.2×10^18 tokens in a single transaction. The SFTAddCirculation function in core/kapp/systemAccount/systemAcount.go increments Circulation before checking the cap, enabling an int64 wraparound that makes the MaxSupply comparison permanently false. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold the mint role for the target SFT nonce - either as the asset owner or as an address explicitly granted the mint role by the owner. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector (PR:N) conflicts directly with the vulnerability description, which requires an active mint-role holder - an explicitly granted on-chain privilege. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Klever-Go to version 1.7.19, which is the vendor-confirmed fixed release available at https://github.com/klever-io/klever-go/releases/tag/v1.7.19; the underlying fix commit is 8bcc600b0ac88070740c63c7ce1c8a968dd85251. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all systems running Klever-Go and identify instances running versions prior to 1.7.19. …
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Unbounded goroutine exhaustion in Klever-Go versions 1.7.14-1.7.17 allows any connected libp2p peer to remotely degrade
Unauthenticated remote crash in Klever-Go versions 1.7.14-1.7.17 allows any network peer to terminate a node process by
Consensus quorum bypass in Klever-Go prior to v1.7.20 allows a low-privileged block producer to satisfy the two-thirds v
Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Integer Overflow
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External POC / Exploit Code
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