CVE-2019-20398 — NULL Pointer Dereference in Libyang

CWE-476 — NULL Pointer Dereference7 documents6 sources
Severity
6.5MEDIUMNVD
EPSS
0.2%
top 57.29%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Cesnet LibyangDebian Libyang
Timeline
PublishedJan 22
Latest updateMay 24

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages3 packages

▶debiandebian/libyang< libyang 1.0.176-1 (bullseye)
▶Debiancesnet/libyang< 1.0.176-1+2
▶NVDcesnet/libyang7 versions+6

Patches

Patch: bugzilla.redhat.com ↗Patch: github.com ↗Patch: bugzilla.redhat.com ↗

🔴Vulnerability Details

2
GHSA
GHSA-q259-qj8c-5r52: A NULL pointer dereference is present in libyang before v1↗2022-05-24
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OSV
CVE-2019-20398: A NULL pointer dereference is present in libyang before v1↗2020-01-22
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📋Vendor Advisories

2
Red Hat
libyang: NULL pointer dereference in function lys_extension_instances_free()↗2019-04-29
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Debian
CVE-2019-20398: libyang - A NULL pointer dereference is present in libyang before v1.0-r3 in the function ...↗2019
▶

💬Community

2
Bugzilla
CVE-2019-20398 libyang: NULL pointer dereference in function lys_extension_instances_free() [fedora-all]↗2020-02-03
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Bugzilla
CVE-2019-20398 libyang: NULL pointer dereference in function lys_extension_instances_free()↗2020-01-22
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