CVE-2026-54755 Klever-Go: Integer overflow in split-royalty validation enables unbounded minting of KLV (native token)
Attackers can exploit an integer overflow in royalty validation to mint unbacked native tokens, affecting Klever blockchain users and operators.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54755?
CVE-2026-54755 is a critical vulnerability in klever-io klever-go, published on 28 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.19, split-royalty fields decoded in core/kapp/builtInFunctions/utils.go can contain values greater than core.HundredPercent, and core/kapp/kda/create.go and core/kapp/kda/trigger.go sum those values in uint32 accumulators. Crafted values such as two 0x80000000 entries wrap the validation sum to zero and pass CheckValid100Params. Royalty payout paths in core/kapp/accounts/accounts.go, core/kapp/market/market.go, and core/kapp/ito/ito.go then credit each oversized split amount and silently discard a negative remainder, allowing ordinary asset transfers, marketplace purchases, or ITO purchases to create unbacked KLV or other assets. This issue is fixed in version 1.7.19.
Weakness: CWE-190
Which versions are affected by CVE-2026-54755?
3 open source packages ship an affected version, including github.com/klever-io/klever-go.
| Package | Affected | Fixed in |
|---|---|---|
github.com/klever-io/klever-go Go | All versions | 1.7.19 |
github.com/klever-io/klever-go Go | All versions | 1.7.19 |
github.com/klever-io/klever-go Go | All versions | 1.7.19 |
How do I fix CVE-2026-54755?
Upgrade github.com/klever-io/klever-go to 1.7.19 or later.
Is CVE-2026-54755 being exploited?
There is no known exploitation of CVE-2026-54755 in the wild and no public exploit code.
Sources
Also known as GHSA-cgc5-v3f2-8m2v, GO-2026-6310.