CVE-2026-117603
Electrum before 4.7.2 Nostr Wallet Connect Plugin Daily Spending Limit Bypass
- State
- Published
- Severity
- 9.3 Critical
- Published
- Oct 27, 2026
- Updated
- Oct 27, 2026
- Reserved
- Oct 27, 2026
Description
Electrum before 4.7.2 contains a spending limit bypass vulnerability in the Nostr Wallet Connect plugin that allows malicious NWC clients to exceed daily_limit_sat by exploiting non-atomic budget checks and millisatoshi truncation. Attackers can send concurrent pay_invoice requests that pass budget_allows_spend() before add_to_budget() runs, or repeatedly pay msat amounts that are floored to whole satoshis, to drain funds beyond the limit.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | 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 | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Products
| Product | Versions |
|---|---|
electrumspesmilo |
|
References
- GitHub Security Advisory (GHSA-q7m2-785w-r585)vendor-advisory
- Patch Commitpatch
- Patch Commitpatch
- VulnCheck Advisory: Electrum before 4.7.2 Nostr Wallet Connect Plugin Daily Spending Limit Bypassthird-party-advisory
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