CVE-2026-82406: Klever-Go
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the native marketplace function core/kapp/market/market.go Buy does not check IsClaimed before accepting a bid. A seller can use the Claim seller-accept branch to settle a resting-bid auction while leaving the claimed order loadable with a future EndTime and stale CurrentBid and CurrentBidder values. A later bidder can submit a higher bid, be debited, and cause the previous bidder to receive a refund even though the NFT has already been delivered. Because Claim and CancelOrder reject the later bidder when I…
Vuln-watch · relayed from the NVD / CVE program; see Source & attribution below
Summary
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the native marketplace function core/kapp/market/market.go Buy does not check IsClaimed before accepting a bid. A seller can use the Claim seller-accept branch to settle a resting-bid auction while leaving the claimed order loadable with a future EndTime and stale CurrentBid and CurrentBidder values. A later bidder can submit a higher bid, be debited, and cause the previous bidder to receive a refund even though the NFT has already been delivered. Because Claim and CancelOrder reject the later bidder when IsClaimed is true, the later bidder cannot obtain the NFT or recover the funds. This issue is fixed in version 1.7.20.
Severity
High (CVSS 7.1), as scored by NVD.
Weakness
- CWE-841
Recommended actions
- Check whether you run or depend on the affected component and version
- Apply the vendor's fix or mitigation from the references below
Source & attribution
This 0xCERT advisory summarises CVE-2026-82406 from the U.S. National Vulnerability Database: https://nvd.nist.gov/vuln/detail/CVE-2026-82406. Details may change; refer to the original source for the authoritative record.
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-82406
- https://github.com/klever-io/klever-go/commit/063bb3ed98f9a84a4b1f7286680613a5fc3c91b2
- https://github.com/klever-io/klever-go/pull/16
- https://github.com/klever-io/klever-go/releases/tag/v1.7.20
- https://github.com/klever-io/klever-go/security/advisories/GHSA-26r5-4mm2-px5c
- https://github.com/klever-io/klever-go/security/advisories/GHSA-26r5-4mm2-px5c
OpenPGP-signed. The signed text of this advisory verifies against the 0xCERT key CCC7 D9EC 9415 723D.
Published 2026-09-23 · last updated 2026-10-08
curl -s https://www.0xcert.com/pgp.asc | gpg --import && curl -s https://www.0xcert.com/advisory/0xCERT-2026-0174/signed.txt | gpg --verify