cve-2026-117601

{
  "cvss": 9.3,
  "datePublished": "2026-10-27T00:00:00Z",
  "dateUpdated": "2026-10-27T00:00:00Z",
  "description": "Electrum before 4.8.3 fails to verify signatures of wallet-owned inputs in unconfirmed mempool transactions, allowing malicious servers to replace a just-broadcast transaction with a conflicting one. Attackers can swallow the user's transaction and display an invalid zero-fee copy paying an attacker address, tricking users into RBF fee-bumping and signing it.",
  "dueDate": "",
  "id": "CVE-2026-117601",
  "kev_catalogs": [
    "vulncheck"
  ],
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Electrum",
  "requiredAction": "Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.",
  "severity": "CRITICAL",
  "source": "vulncheck_kev",
  "title": "electrum electrum Improper Verification of Cryptographic Signature",
  "vendor": "spesmilo"
}