CVE-2019-20398

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Source
https://nvd.nist.gov/vuln/detail/CVE-2019-20398
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-20398.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2019-20398
Downstream
Published
2020-01-22T22:15:10Z
Modified
2025-10-21T05:02:53.555676Z
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

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

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