CVE-2019-20398

MediumCVSS 6.5/10Last 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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://bugzilla.redhat.com/show_bug.cgi?id=1793935Issue Tracking, Patch, Third Party Advisory
https://github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08Patch
https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3Third Party Advisory
https://github.com/CESNET/libyang/issues/773Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html
https://bugzilla.redhat.com/show_bug.cgi?id=1793935Issue Tracking, Patch, Third Party Advisory
https://github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08Patch
https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3Third Party Advisory
https://github.com/CESNET/libyang/issues/773Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html

Timeline

Published: Jan 22, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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