Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/spesmilo/electrum/commit/90fe30822561e515a9d2d6e5a352cc077809
- https://github.com/spesmilo/electrum/security/advisories/GHSA-6jp4-8v48-cc5v
- https://www.vulncheck.com/advisories/electrum-before-4.8.3-missing-signature-ver
FAQ
What is CVE-2026-117601?
CVE-2026-117601 is a vulnerability with a CVSS score of 7.5 (HIGH). 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. ...
How severe is CVE-2026-117601?
CVE-2026-117601 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-117601?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.