CVE-2019-20391: Cesnet Libyang

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

An invalid memory access flaw is present in libyang before v1.0-r3 in the function resolve_feature_value() when an if-feature statement is used inside a bit. Applications that use libyang to parse untrusted input yang files may crash.

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.