CVE-2026-117601

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{"bugzilla": {"description": "electrum: Electrum before 4.8.3 Missing Signature Verification of Mempool Transactions", "id": "2561987", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2561987"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-347", "details": ["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.", "A flaw was found in electrum. A connected malicious server can exploit this vulnerability to cause theft of funds by replacing a legitimate transaction with a fraudulent transfer. Because the application fails to verify cryptographic signatures on unconfirmed transactions, the attacker can display a spoofed transaction paying an attacker-controlled address. This issue allows the server to deceive the user into signing a fee adjustment, resulting in the unauthorized transfer of funds."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-117601", "public_date": "2026-10-27T13:09:51Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-117601\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-117601\nhttps://github.com/spesmilo/electrum/commit/90fe30822561e515a9d2d6e5a352cc07780999eb\nhttps://github.com/spesmilo/electrum/security/advisories/GHSA-6jp4-8v48-cc5v\nhttps://www.vulncheck.com/advisories/electrum-before-4.8.3-missing-signature-verification-of-mempool-transactions"], "statement": "This vulnerability affects the Electrum package shipped in Fedora. No other Red Hat products are affected. Exploitation requires a malicious Electrum server and the user subsequently fee-bumping and signing a substituted transaction, potentially transferring funds to an attacker.", "threat_severity": "Important"}

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