CVE-2015-1855: Debian Linux

Medium severity, CVSS 5.9. EPSS: 2.8% chance of exploitation in the next 30 days.

verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does not properly validate hostnames, which allows remote attackers to spoof servers via vectors related to (1) multiple wildcards, (1) wildcards in IDNA names, (3) case sensitivity, and (4) non-ASCII characters.

Affected products

• Debian Debian Linux: version 7.0 only; version 8.0 only; version 9.0 only
• Puppet Puppet Agent: version 1.0.0 only
• Puppet Puppet Enterprise: from 3.0.0, before 3.8.0 (fixed in 3.8.0)
• Ruby-Lang Ruby: from 2.1.0, before 2.1.6 (fixed in 2.1.6); from 2.2.0, before 2.2.2 (fixed in 2.2.2); version 2.0.0 only
• Ruby-Lang Trunk: before 50292 (fixed in 50292)

Published 2019-11-29. Last modified 2026-06-17.