CVE-2023-26557: Iofinnet Tss-Lib

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

io.finnet tss-lib before 2.0.0 can leak the lambda value of a private key via a timing side-channel attack because it relies on Go big.Int, which is not constant time for Cmp, modular exponentiation, or modular inverse. An example leak is in crypto/paillier/paillier.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.