CVE-2019-20398

See a problem?
Please try reporting it to the source first.
Source
https://nvd.nist.gov/vuln/detail/CVE-2019-20398
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-20398.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2019-20398
Downstream
Published
2020-01-22T22:15:10Z
Modified
2025-09-16T07:02:59.331324Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

A NULL pointer dereference is present in libyang before v1.0-r3 in the function lysextensioninstancesfree() due to a copy of unresolved extensions in lysrestr_dup(). Applications that use libyang to parse untrusted input yang files may crash.

References

Affected packages

Debian:11 / libyang

Package

Name
libyang
Purl
pkg:deb/debian/libyang?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.0.176-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / libyang

Package

Name
libyang
Purl
pkg:deb/debian/libyang?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.0.176-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14 / libyang

Package

Name
libyang
Purl
pkg:deb/debian/libyang?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.0.176-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Git / github.com/cesnet/libyang

Affected ranges

Type
GIT
Repo
https://github.com/cesnet/libyang
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
7852b272ef77f8098c35deea6c6f09cb78176f08

Affected versions

v0.*

v0.11-r1
v0.11-r2
v0.12-r1
v0.12-r2
v0.13-r1
v0.13-r2
v0.14-r1
v0.15-r1
v0.16-r1
v0.16-r2
v0.16-r3

v1.*

v1.0-r1
v1.0-r2

Database specific 

{
    "vanir_signatures": [
        {
            "target": {
                "file": "src/tree_schema.c"
            },
            "digest": {
                "line_hashes": [
                    "47057829883453850662777565401974008433",
                    "2962779122798403009016500093738661883",
                    "35155857828643995570069637654412522537",
                    "177345036629041976534470018548302784898",
                    "33582507515680815319481015823527354523"
                ],
                "threshold": 0.9
            },
            "signature_version": "v1",
            "source": "https://github.com/cesnet/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08",
            "id": "CVE-2019-20398-599ecb19",
            "signature_type": "Line",
            "deprecated": false
        },
        {
            "target": {
                "function": "lys_restr_dup",
                "file": "src/tree_schema.c"
            },
            "digest": {
                "length": 909.0,
                "function_hash": "310547109486459982374848703543419293865"
            },
            "signature_version": "v1",
            "source": "https://github.com/cesnet/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08",
            "id": "CVE-2019-20398-b0f6280f",
            "signature_type": "Function",
            "deprecated": false
        }
    ]
}