CVE-2017-9526: Gnupg Libgcrypt

Medium severity, CVSS 5.9. EPSS: 2.3% chance of exploitation in the next 30 days.

In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.

Affected products

• Gnupg Libgcrypt: up to and including 1.7.6

Published 2017-06-11. Last modified 2026-06-17.