CVE-2021-45698: Nervos Ckb

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

An issue was discovered in the ckb crate before 0.40.0 for Rust. A get_block_template RPC call may fail in situations where it is supposed to select a Nervos CKB blockchain transaction with a higher fee rate than another transaction.

Affected products

• Nervos Ckb: before 0.40.0 (fixed in 0.40.0)

Published 2021-12-27. Last modified 2026-06-17.