CVE-2023-26556: Iofinnet Tss-Lib

Critical severity, CVSS 9.1. EPSS: 0.9% chance of exploitation in the next 30 days.

io.finnet tss-lib before 2.0.0 can leak a secret key via a timing side-channel attack because it relies on the scalar-multiplication implementation in Go crypto/elliptic, which is not constant time (there is an if statement in a loop). One leak is in ecdsa/keygen/round_2.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)

Affected products

• Iofinnet Tss-Lib: before 2.0.0 (fixed in 2.0.0)

Published 2023-04-21. Last modified 2026-06-17.