CVE-2019-20398

PoC —

CVSS 3.1

6.5 medium

EPSS

2%p78

Published

Jan 22, 2020 (Jan 22, 2020)

Modified

Jun 17, 2026

Description

A NULL pointer dereference is present in libyang before v1.0-r3 in the function lys_extension_instances_free() due to a copy of unresolved extensions in lys_restr_dup(). Applications that use libyang to parse untrusted input yang files may crash.

Vendors: cesnet
Products: libyang
Weakness: CWE-476
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (1.8%)

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