NULL Pointer Dereference Affecting libyang package, versions <0:1.0.184-1.el8


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.22% (60th percentile)

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  • Snyk IDSNYK-RHEL8-LIBYANG-3399003
  • published26 Jul 2021
  • disclosed29 Apr 2019

Introduced: 29 Apr 2019

CVE-2019-20398  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade RHEL:8 libyang to version 0:1.0.184-1.el8 or higher.
This issue was patched in RHEA-2021:1906.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libyang package and not the libyang package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1