Critical · CVSS 9.3CVE-2026-117603

Electrum before 4.7.2 Nostr Wallet Connect Plugin Daily Spending Limit BypassCVE-2026-117603

Answer in brief

CVE-2026-117603 records a Critical severity (CVSS 9.3) vulnerability in Electrum before 4.7.2 Nostr Wallet Connect Plugin Daily Spending Limit Bypass. The current sources do not mark it as known exploited. The current feed maps spesmilo/electrum (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 27, 2026Updated Oct 27, 2026Source checked Oct 27, 2026First seen by HOL Oct 27, 2026Material review Oct 27, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps spesmilo/electrum (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
spesmilo/electrumgeneric	>=0 <4.7.2	4.7.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for spesmilo/electrum.
Review the reported fix. Update spesmilo/electrum to 4.7.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 27, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.