critical7.5
CVE-2026-117601
Electrum before 4.8.3 fails to verify signatures of wallet-owned inputs in unconfirmed mempool transactions, allowing malicious servers to replace a just-broad…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | electrum | < 4.8.3 | 4.8.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-6jp4-8v48-cc5v
- https://github.com/spesmilo/electrum/security/advisories/GHSA-6jp4-8v48-cc5v
- https://nvd.nist.gov/vuln/detail/CVE-2026-117601
- https://github.com/spesmilo/electrum/commit/90fe30822561e515a9d2d6e5a352cc07780999eb
- https://www.binance.com/en/square/post/381361716824742
- https://www.vulncheck.com/advisories/electrum-before-4.8.3-missing-signature-verification-of-mempool-transactions