# CVE-2019-19333: libyang: The libyang package provides a library for YANG data modeling language

CVE-2019-19333 is fixed in libyang on 1 platform, first by RHSA-2019:4360, released December 23, 2019. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2019-19333
- Priority: High
- CVSS: 9.8 (Important)
- EPSS: 0.0364
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 23, 2019

## Description

The libyang package provides a library for YANG data modeling language. libyang is a YANG data modelling language parser and toolkit written (and providing API) in C. The library is used e.g. in libnetconf2, Netopeer2, sysrepo and FRRouting projects.  Security Fix(es):  * libyang: stack-based buffer overflow in make_canonical when bits leaf type is used (CVE-2019-19333)  * libyang: stack-based buffer overflow in make_canonical when identityref leaf type is used (CVE-2019-19334)  For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.  IMPORTANT:  The libyang-devel sub-package has recently been removed from the AppStream repository. If you have previously installed libyang-devel, remove it prior to applying this advisory to make the update successful.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libyang RHEL 8 | 0:0.16.105-3.el8_1.2 | [RHSA-2019:4360](https://patchblox.com/security/data/fix/linux/rhsa-2019-4360.md) | Dec 23, 2019 |
| Linux | libyang ol 8 | 0:0.16.105-3.el8_1.2 | [ELSA-2019-4360](https://patchblox.com/security/data/fix/linux/elsa-2019-4360.md) | Dec 24, 2019 |

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