CVE-2019-20396: Cesnet Libyang

Medium severity, CVSS 6.5. EPSS: 1.9% chance of exploitation in the next 30 days.

A segmentation fault is present in yyparse in libyang before v1.0-r1 due to a malformed pattern statement value during lys_parse_path parsing.

Affected products

• Cesnet Libyang: version 0.11 only; version 0.12 only; version 0.13 only; version 0.14 only; version 0.15 only; version 0.16 only

Published 2020-01-22. Last modified 2026-06-17.