CVE-2026-117601
Electrum before 4.8.3 fails to verify signatures of wallet-owned inputs in unconfirmed mempool…
- Risk score
- 50/100
- CVSS
- 7.5 v3.1
- Published
- 27 Oct 2026
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What to know
- What it is
- 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 …
- Affected
- See advisory
- Fix
- Upgrade the product to 4.8.3 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 7.5 high
- Remotely exploitable without logging in
References
Original 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.
Last activity 27 Oct 2026. Patch Forecast updates every hour.