Dashboard / CVE-2026-117601

CVE-2026-117601

CRITICAL
INFO Priority: 0.02 BB Relevance: 79/100
Published: 2026-10-27 Modified: 2026-10-28 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
AT: None
VC: High
VI: High
VA: High

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
spesmilo electrum 0 < 4.8.3
spesmilo electrum 0 < 4.8.3

References & Advisories (3)

Bug Bounty Relevance

79 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

9.3 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS — Exploitation Probability

0.18%
Raw Score 0.001760
Percentile 7.1%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00176
2026-10-28
0.00176

Intelligence Sources

mitre ref →
nvd ref →

External Links