CVE-2019-19334

high-risk

Published 2019-12-06

In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type "identityref". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.

Do I need to act?

0.78% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Fix available

Upgrade to: 6980afae2ff9fcd6d67508b0a3f694d75fd059d6

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (17)

Libyang

Enterprise Linux

Fedora

Affected Vendors

Redhat Fedoraproject Cesnet

References (10)

https://access.redhat.com/errata/RHSA-2019:4360

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19334

Patch https://github.com/CESNET/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d...

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

https://access.redhat.com/errata/RHSA-2019:4360

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19334

Patch https://github.com/CESNET/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d...

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

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high-risk

Severity 32/34 · Critical

Exploitability 3/34 · Minimal

Exposure 19/34 · Moderate