{"id":"GHSA-9wh6-9hq7-9688","revision":null,"records":[{"revision":"5d7b4619839f46ffbce1144cec3edc42","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-82407","aliases":[],"title":"Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS","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.","state":0,"publishedAt":"2026-09-23T19:17:59.006+00:00","modifiedAt":"2026-09-23T19:42:17.556+00:00","affected":[{"ecosystem":"Vendor product","name":"klever-go","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"klever-io\",\n                    \"product\": \"klever-go\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.7.20\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":7,"severity":"HIGH"}],"references":["https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688","https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff","https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f","https://github.com/klever-io/klever-go/releases/tag/v1.7.20"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-82407","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-82407","identifiers":["CVE-2026-82407"]},"retained":false,"historicalAffected":[]},{"revision":"c433fef02d7c4c338c5feba8ebaf6594","observedAt":"2026-11-11T16:11:05.43+00:00","statement":{"source":"euvd","id":"EUVD-2026-85576","aliases":["CVE-2026-82407","GHSA-9wh6-9hq7-9688"],"title":"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…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","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","score":7,"severity":null}],"references":["https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688","https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff","https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f","https://github.com/klever-io/klever-go/releases/tag/v1.7.20"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-85576","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 23, 2026, 7:17:59 PM","dateUpdated":"Sep 23, 2026, 7:42:17 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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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.","state":0,"publishedAt":"2026-09-23T20:17:16.707+00:00","modifiedAt":"2026-09-23T20:17:16.847+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":7,"severity":"HIGH"}],"references":["https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff","https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f","https://github.com/klever-io/klever-go/releases/tag/v1.7.20","https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-82407","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-20"],"productCriteria":[],"sourceDates":{"published":"2026-09-23T20:17:16.707","lastModified":"2026-09-23T20:17:16.847"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-82407","identifiers":["CVE-2026-82407"]},"retained":false,"historicalAffected":[]},{"revision":"ff9578f1332543aca293e6c90c668a05","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-9wh6-9hq7-9688","aliases":["CVE-2026-82407","GO-2026-6586"],"title":"Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS","description":"**Location:** `core/kapp/validators/validators.go:201` (`Register`), (`genesis/checking/nodesSetupChecker.go:73`). `core/consensus/slot/bls/subslotStartSlot.go:165` `core/consensus/.../headerSignatureVerify.go:123` (`Create(...)`).\n\n### Description\n\nKlever uses a BDN (Boneh-Drijvers-Neven) BLS multi-signature over BLS12-381 to finalize blocks (`crypto/signing/mcl/multisig/bls.go`, herumi/bls-go-binary). The library is initialized with only `bls.Init(bls.BLS12_381)` and no order-verification flags, so `Deserialize` does not enforce prime-order-subgroup membership  subgroup safety relies on explicit `IsValidOrder()` calls in the wrappers.\n\nRuntime validator registration (`validators.Register`) stores the submitted 96-byte `BLSPublicKey` via `SetBLSPublicKey` with **no curve check, no subgroup check, and no proof-of-possession** (`CreateValidatorContract` carries the key but no signature proving key ownership; grep confirms no `proofOfPossession`/`VerifyProof`/`BLSSignature` verification anywhere in `core/kapp/validators/`). `CheckPublicKeyValid` — which does `IsValid && IsValidOrder && !IsZero` — runs only at genesis, not on runtime registration/update.\n\n### POC\n\nAttack: \n(1) stake the minimum to register a validator, submitting a 96-byte `BLSPublicKey` that is not a valid G2 point (arbitrary bytes). Registration succeeds. \n(2) Once the validator is eligible and selected into a consensus group, every in-group node  including the honest leader (`group[0]`)  calls `MultiSigner().Reset(groupPubKeys, selfIndex)` at slot start, which deserializes all group keys via `PublicKeyFromByteArray` → herumi `Deserialize` **deterministically fails** on the malformed key → `SetSlotCanceled(true)`. The verify side (`Create(consensusPubKeys)`) fails identically. No block is produced for that round. \n\n\n\n### Impact\n\nEvery consensus round whose group contains the malformed-key validator is a missed slot. One eligible bad-key validator poisons roughly a `groupSize / eligibleSet` fraction of rounds → sustained liveness degradation. **Where the consensus group equals the eligible set (small or early-stage networks), this is a full chain halt.** Cost is the minimum validator stake, permissionless, and repeatable; no fork flag gates the missing validation. \n\nRated **High** (Byzantine liveness; Critical on small validator sets). The severity scales down to a fractional missed-slot / throughput-degradation attack on a large validator set where the bad validator is only occasionally in the active group.\n\n### Recommendation\n\nEnforce `CheckPublicKeyValid` (curve + prime-order subgroup + non-zero) on the submitted BLS key at runtime validator registration and config-update, and ideally require a proof-of-possession (a BLS signature over the validator's own key/identity) at registration to prove key ownership and well-formedness. Gate the stricter validation behind an epoch fork flag for reprocessing consistency.","state":0,"publishedAt":"2026-09-23T21:24:08+00:00","modifiedAt":"2026-10-01T20:56:13.3190484+00:00","affected":[{"ecosystem":"Go","name":"github.com/klever-io/klever-go","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.7.20"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688","https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff","https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f","https://github.com/klever-io/klever-go","https://github.com/klever-io/klever-go/releases/tag/v1.7.20"],"sourceUrl":"https://github.com/advisories/GHSA-9wh6-9hq7-9688","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-9wh6-9hq7-9688","identifiers":["GHSA-9wh6-9hq7-9688","CVE-2026-82407","GO-2026-6586"]},"retained":false,"historicalAffected":[]},{"revision":"6bf7a2cd8efd4e21b4e3edc2f80d0314","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6586","aliases":["CVE-2026-82407","GHSA-9wh6-9hq7-9688"],"title":"Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS in github.com/klever-io/klever-go","description":"Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS in github.com/klever-io/klever-go","state":0,"publishedAt":"2026-10-01T20:23:38+00:00","modifiedAt":"2026-10-01T20:45:15.8837171+00:00","affected":[{"ecosystem":"Go","name":"github.com/klever-io/klever-go","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.7.20"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688","https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff","https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f","https://github.com/klever-io/klever-go/releases/tag/v1.7.20"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6586","license":"OSV · upstream source license applies","key":"osv:GO-2026-6586","identifiers":["GO-2026-6586","CVE-2026-82407","GHSA-9wh6-9hq7-9688"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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