CVE-2026-55764Public exploitNetwork attack vectorHinoki check available

Unbounded SFT minting via signed circulation overflow

Published Aug 28, 2026 · Updated Aug 28, 2026

Integer overflow in Klever klever-go before 1.7.19 allows remote authenticated users with a mint role to exceed an SFT nonce supply cap. SFTAddCirculation adds the raw signed amount to meta.Circulation before checking MaxSupply, so int64 wraparound makes the comparison accept the mint. The caller must control an asset's mint role; a crafted add-quantity transaction then credits about MaxInt64 units and leaves the on-chain circulation counter negative.

CVSS severity8.7
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Integer overflow in Klever klever-go before 1.7.19 allows remote authenticated users with a mint role to exceed an SFT nonce supply cap. SFTAddCirculation adds the raw signed amount to meta.Circulation before checking MaxSupply, so int64 wraparound makes the comparison accept the mint. The caller must control an asset's mint role; a crafted add-quantity transaction then credits about MaxInt64 units and leaves the on-chain circulation counter negative.

The record

CVE
CVE-2026-55764
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
Klever
Product
klever-go
Classifications
CWE-190, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.7.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Klever · klever-goversion=< 1.7.19

Published CVSS scores

8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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