CVE-2006-4339: OpenSSL

Medium severity, CVSS 4.3. EPSS: 5.1% chance of exploitation in the next 30 days.

OpenSSL before 0.9.7, 0.9.7 before 0.9.7k, and 0.9.8 before 0.9.8c, when using an RSA key with exponent 3, removes PKCS-1 padding before generating a hash, which allows remote attackers to forge a PKCS #1 v1.5 signature that is signed by that RSA key and prevents OpenSSL from correctly verifying X.509 and other certificates that use PKCS #1.

Affected products

• OpenSSL OpenSSL: up to and including 0.9.7; version 0.9.1c only; version 0.9.2b only; version 0.9.3 only; version 0.9.3a only; version 0.9.4 only; …

Published 2006-09-05. Last modified 2026-06-16.