{"schema":"threatline.record/2","record":{"id":"CVE-2026-117601","aliases":["GHSA-6jp4-8v48-cc5v"],"summary":"Electrum before 4.8.3 Missing Signature Verification of Mempool Transactions","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.","categories":["Unclassified"],"product":"electrum","vendor":"spesmilo","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-117601","source_modified_at":"2026-10-27T13:09:51.347Z","fetched_at":"2026-10-27T16:27:21.584480Z","product":"electrum","vendor":"spesmilo","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"4.8.3"},{"version":"4.8.3","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-117601","source_modified_at":"2026-10-27T13:09:51.347Z","fetched_at":"2026-10-27T16:27:21.584480Z","package":{"name":"electrum","ecosystem":null},"version":"4.8.3","basis":"first unaffected version stated in the CVE record"}],"cvss":9.3,"severity":"Critical","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-27T13:09:51.347Z","modified_at":"2026-10-27T13:09:51.347Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-117601","fetched_at":"2026-10-27T16:27:21.584480Z","source_modified_at":"2026-10-27T13:09:51.347Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/spesmilo/electrum/security/advisories/GHSA-6jp4-8v48-cc5v","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://github.com/spesmilo/electrum/commit/90fe30822561e515a9d2d6e5a352cc07780999eb","tags":["patch"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/electrum-before-4.8.3-missing-signature-verification-of-mempool-transactions","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-27T13:09:51.347Z","content_hash":"9e393a9ed70d0804a5e56caf9ad7144f303b8bb94769f0cf0bc229dfa3a14393"}}