{"id":"CVE-2026-82409","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-82409","generatedAt":"2026-10-28T00:18:49.963Z","title":"Prior to 1.7.20, indexer/common.go serializedDataForUpdateAccounts places the attacker-controlled acc.Name value into an Elasticsearch _bulk JSON and NDJSON request without escaping it.","description":"Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, indexer/common.go serializedDataForUpdateAccounts places the attacker-controlled acc.Name value into an Elasticsearch _bulk JSON and NDJSON request without escaping it. The SetAccountName transaction accepts valid UTF-8 account names containing quotes, backslashes, and newlines, and the resulting name is stored in consensus account state. When an indexer processes the account, those characters can break the JSON string, reject a bulk batch, or inject additional bulk actions that create, overwrite, or delete documents in indices writable by the indexer. The persistent state value is replayed by new or historical indexers, and direct access to the indexing host or Elasticsearch port is not required. This issue is fixed in version 1.7.20.","published":"2026-09-23T20:17:17.000Z","lastModified":"2026-09-24T16:17:12.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":8.4,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-116"],"affected":[],"epss":{"score":0.0034,"percentile":0.27306,"date":"2026-10-26","history":[{"date":"2026-09-24","score":0.00268,"percentile":0.16816}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-23T20:17:17.000Z","detail":{"score":"8.4","severity":"HIGH","publishedAt":"2026-09-23T20:17:16.893Z"},"summary":"New CVE, high severity (CVSS 8.4)."}],"references":[{"url":"https://github.com/klever-io/klever-go/commit/f00366768b24be18fa7ae9de2e1905caa8b350af","source":"security-advisories@github.com"},{"url":"https://github.com/klever-io/klever-go/commit/f54ea730cc80a3ba4f906586a7d221b281548190","source":"security-advisories@github.com"},{"url":"https://github.com/klever-io/klever-go/releases/tag/v1.7.20","source":"security-advisories@github.com"},{"url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-7c7c-373r-gfjj","source":"security-advisories@github.com"},{"url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-7c7c-373r-gfjj","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-82409","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}