electrum: Electrum before 4.8.3 fails to verify signatures of wallet-owned inputs in unconfirmed mempool transactions, allowing...
CVE-2026-117601 is fixed in electrum on 1 platform by DEBIAN-CVE-2026-117601 (version 4.8.3+dfsg-1), released October 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| electrum · Debian 14 | 4.8.3+dfsg-1 | DEBIAN-CVE-2026-117601 | Oct 30, 2026 |
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