CVE-2019-20393

HighCVSS 8.8/10Last modified Jun 17, 2026

Description

A double-free is present in libyang before v1.0-r1 in the function yyparse() when an empty description is used. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-415

Affected software

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

References

https://bugzilla.redhat.com/show_bug.cgi?id=1793930Issue Tracking, Patch, Third Party Advisory
https://github.com/CESNET/libyang/commit/d9feacc4a590d35dbc1af21caf9080008b4450edPatch, Third Party Advisory
https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1Third Party Advisory
https://github.com/CESNET/libyang/issues/742Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html
https://bugzilla.redhat.com/show_bug.cgi?id=1793930Issue Tracking, Patch, Third Party Advisory
https://github.com/CESNET/libyang/commit/d9feacc4a590d35dbc1af21caf9080008b4450edPatch, Third Party Advisory
https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1Third Party Advisory
https://github.com/CESNET/libyang/issues/742Exploit, 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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