Vulnerability DatabaseCVE-2026-117601
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CVE-2026-117601
Published:October 27, 2026
Updated:October 28, 2026
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.
Affected Packages
https://github.com/spesmilo/electrum.git (GITHUB):
Affected version(s) >=4.0.0b0 <4.8.3
Fix Suggestion:
Update to version 4.8.3
Related Resources (6)
https://nvd.nist.gov/vuln/detail/CVE-2026-117601
https://github.com/spesmilo/electrum/security/advisories/GHSA-6jp4-8v48-cc5v
https://github.com/spesmilo/electrum/commit/90fe30822561e515a9d2d6e5a352cc07780999eb
https://github.com/spesmilo/electrum
https://www.binance.com/en/square/post/381361716824742
https://www.vulncheck.com/advisories/electrum-before-4.8.3-missing-signature-verification-of-mempool-transactions
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CVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Verification of Cryptographic Signature
CWE-347