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CVE-2026-82407— Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS

Quick assessment

Affected
klever-io klever-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, core/kapp/validators/validators.go Register and the runtime validator update path accept a submitted BLSPublicKey without curve, prime-order subgroup, or nonzero validation.

CVSS 7.0 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
klever-io klever-go < 1.7.20 affected
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I. Basic Information for CVE-2026-82407

Vulnerability Information

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Vulnerability Title
Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS
Source: CVE Program / CVE List V5
Vulnerability Description
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, core/kapp/validators/validators.go Register and the runtime validator update path accept a submitted BLSPublicKey without curve, prime-order subgroup, or nonzero validation. When a validator with a malformed key becomes eligible and is selected into a consensus group, MultiSigner.Reset and the corresponding signature verification creation path cannot deserialize the group key and cancel the slot. This causes repeated missed rounds and throughput degradation, and a network whose consensus group equals the eligible validator set can halt completely. Genesis validation is not affected because that path already performs CheckPublicKeyValid. This issue is fixed in version 1.7.20.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
klever-io klever-go < 1.7.20 -

II. Public POCs for CVE-2026-82407

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III. Intelligence Information for CVE-2026-82407

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Other References for CVE-2026-82407 (4)

Same Patch Batch · klever-io · 2026-09-23 · 6 CVEs total

CVE-2026-82405 8.7 HIGH Klever-Go Account takeover: `kleverUpdateAccountPermission` authorizes on attacker-control
CVE-2026-86064 8.6 HIGH Klever-Go: /log controls global node logging
CVE-2026-82409 8.4 HIGH Klever-Go: Elasticsearch bulk / painless injection via on-chain account name -> explorer/
CVE-2026-86065 7.5 HIGH Klever-Go: Unauthenticated WebSocket /subscribe: no read-size limit, no connection cap, pe
CVE-2026-82406 7.1 HIGH Klever-Go: Zombie-order theft: `Buy` missing `IsClaimed` guard in native marketplace

IV. Related Vulnerabilities

Same product: klever-go
Same vendor: klever-io
Same weakness: CWE-20

V. Comments for CVE-2026-82407

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