CVE-2010-1378: Apple Mac OS X

Critical severity, CVSS 9.8. EPSS: 1.3% chance of exploitation in the next 30 days.

OpenSSL in Apple Mac OS X 10.6.x before 10.6.5 does not properly perform arithmetic, which allows remote attackers to bypass X.509 certificate authentication via an arbitrary certificate issued by a legitimate Certification Authority.

Affected products

• Apple Mac OS X: from 10.6.0, before 10.6.5 (fixed in 10.6.5)
• Apple Mac OS X Server: from 10.6.0, before 10.6.5 (fixed in 10.6.5)

Published 2010-11-15. Last modified 2026-06-16.