CVE-2019-20392

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-01-22 · updated 2026-06-17
Weakness: CWE-119

Description

An invalid memory access flaw is present in libyang before v1.0-r1 in the function resolve_feature_value() when an if-feature statement is used inside a list key node, and the feature used is not defined. Applications that use libyang to parse untrusted input yang files may crash.

Affected products

CESNET libyang: 0.11-r1, 0.11-r2, 0.12-r1, 0.12-r2, 0.13-r1, 0.13-r2 (+5)

References

https://bugzilla.redhat.com/show_bug.cgi?id=1793922
https://github.com/CESNET/libyang/commit/32fb4993bc8bb49e93e84016af3c10ea53964be5
https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1
https://github.com/CESNET/libyang/issues/723
https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html
https://bugzilla.redhat.com/show_bug.cgi?id=1793922
https://github.com/CESNET/libyang/commit/32fb4993bc8bb49e93e84016af3c10ea53964be5
https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1
https://github.com/CESNET/libyang/issues/723
https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html

Get alerted when CVE-2019-20392 or the next vulnerability affects your stack