CVE-2026-117603 — Vulnerability intelligence
spesmilo — electrum
Published:
- CVSS
- 9.3
- CISA KEV
- Not listed; not proof of no exploitation
Original source text (not a translation)
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.