CVE-2013-6393: Canonical Ubuntu Linux

Medium severity, CVSS 6.8. EPSS: 7.4% chance of exploitation in the next 30 days.

The yaml_parser_scan_tag_uri function in scanner.c in LibYAML before 0.1.5 performs an incorrect cast, which allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted tags in a YAML document, which triggers a heap-based buffer overflow.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 12.10 only; version 13.10 only
• Debian Debian Linux: version 6.0 only; version 7.0 only
• Opensuse Leap: version 42.1 only
• Opensuse Opensuse: version 11.4 only; version 13.1 only; version 13.2 only
• Pyyaml Libyaml: up to and including 0.1.4; version 0.0.1 only; version 0.1.1 only; version 0.1.2 only; version 0.1.3 only
• Red Hat Openstack: version 3.0 only; version 4.0 only

Published 2014-02-06. Last modified 2026-06-17.