Bug 2561987 (CVE-2026-117601) - CVE-2026-117601 electrum: Electrum before 4.8.3 Missing Signature Verification of Mempool Transactions
Summary: CVE-2026-117601 electrum: Electrum before 4.8.3 Missing Signature Verificatio...
Keywords:
Status: NEW
Alias: CVE-2026-117601
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2562802 2562804 2562805 2562806
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-27 14:00 UTC by OSIDB Bzimport
Modified: 2026-10-28 11:22 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-10-27 14:00:33 UTC 
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.
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