CVE-2026-117601

HighCVSS 7.5/10Last modified Oct 28, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-347

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
spesmilo	electrum	< 4.8.3

References

Timeline

Published: Oct 27, 2026
Last modified: Oct 28, 2026
NVD status: Awaiting Analysis

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