{"id":"CVE-2026-117601","revision":"e1918172583943bdb8c09f1777dd1f22","records":[{"revision":"e1918172583943bdb8c09f1777dd1f22","observedAt":"2026-10-28T17:46:48.824+00:00","statement":{"source":"cve-program","id":"CVE-2026-117601","aliases":[],"title":"Electrum before 4.8.3 Missing Signature Verification of Mempool Transactions","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.","state":0,"publishedAt":"2026-10-27T13:09:51.347+00:00","modifiedAt":"2026-10-28T16:16:43.752+00:00","affected":[{"ecosystem":"Vendor product","name":"electrum","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"spesmilo\",\n                    \"product\": \"electrum\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"4.8.3\"\n                        },\n                        {\n                            \"version\": \"4.8.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":9.3,"severity":"CRITICAL"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/spesmilo/electrum/security/advisories/GHSA-6jp4-8v48-cc5v","https://github.com/spesmilo/electrum/commit/90fe30822561e515a9d2d6e5a352cc07780999eb","https://www.vulncheck.com/advisories/electrum-before-4.8.3-missing-signature-verification-of-mempool-transactions"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-117601","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-117601","identifiers":["CVE-2026-117601"]},"retained":false,"historicalAffected":[]}],"coverage":[]}