Vulnerability details
CVE-2026-117603
spesmilo electrum
Electrum before 4.7.2 Nostr Wallet Connect Plugin Daily Spending Limit Bypass
CVSS 4.0
9.3Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 4.3Medium | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| spesmilo | electrum | v < 4.7.2 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://github.com/spesmilo/electrum/security/advisories/GHSA-q7m2-785w-r585 vendor-advisory
- https://github.com/spesmilo/electrum/commit/5222374046d2a92da371d46c79ce0e61e7e2a42d patch
- https://github.com/spesmilo/electrum/commit/3956bff0684f6060fbe8c823c3ee921928cdcaa5 patch
- https://www.vulncheck.com/advisories/electrum-before-4.7.2-nostr-wallet-connect-plugin-daily-spending-limit-bypass third-party-advisory
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Details
- Published
- 2026-10-27
- Last updated
- 2026-11-02
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 16 · Low
Exploit prediction (EPSS)
0.19%
Probability of exploitation in 30 days
9.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition