Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M
CVE-2026-82407Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS
High 7.0
In plain English
A high-severity improper input validation in klever-go from klever-io. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/klever-io/klever-go | 1.7.20 | GHSA-9wh6-9hq7-9688 |
| Go | github.com/klever-io/klever-go | 1.7.20 | GO-2026-6586 |
Affected products (as reported)
Weakness: CWE-20 · Vector: 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
References
- https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688 x_refsource_CONFIRM
- https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff x_refsource_MISC
- https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f x_refsource_MISC
- https://github.com/klever-io/klever-go/releases/tag/v1.7.20 x_refsource_MISC