Critical
Security advisory
In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type "identityref". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-19334
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:35 UTC · Revision 1
Source evidence
In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type "identityref". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.
osv:CVE-2019-19334
Complete source record
{
"id": "3e4b5d2a801d2d3f8293d7171d03d2fa348aa5f34cd938c0189e799839fe61c6",
"url": "https://osv.dev/vulnerability/CVE-2019-19334",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-19334",
"summary": "In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type \"identityref\". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.",
"evidence": "osv:CVE-2019-19334",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2019-19334",
"aliases": [
"CVE-2019-19334"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/cesnet/libyang",
"type": "GIT",
"events": [
{
"introduced": "14a95280b2bd77b5fd1d9b5f8af71b15679f1a8f"
},
{
"last_affected": "64248ec90179740e66416c78e0b3b914a8a07d30"
},
{
"fixed": "6980afae2ff9fcd6d67508b0a3f694d75fd059d6"
}
],
"database_specific": {
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"cpe": "cpe:2.3:a:cesnet:libyang:0.11:r1:*:*:*:*:*:*",
"range": [
{
"introduced": "0.11-r1"
},
{
"last_affected": "0.11-r1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:0.11:r2:*:*:*:*:*:*",
"range": [
{
"introduced": "0.11-r2"
},
{
"last_affected": "0.11-r2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:0.12:r1:*:*:*:*:*:*",
"range": [
{
"introduced": "0.12-r1"
},
{
"last_affected": "0.12-r1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:0.12:r2:*:*:*:*:*:*",
"range": [
{
"introduced": "0.12-r2"
},
{
"last_affected": "0.12-r2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:0.13:r1:*:*:*:*:*:*",
"range": [
{
"introduced": "0.13-r1"
},
{
"last_affected": "0.13-r1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:0.13:r2:*:*:*:*:*:*",
"range": [
{
"introduced": "0.13-r2"
},
{
"last_affected": "0.13-r2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:0.14:r1:*:*:*:*:*:*",
"range": [
{
"introduced": "0.14-r1"
},
{
"last_affected": "0.14-r1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:0.15:r1:*:*:*:*:*:*",
"range": [
{
"introduced": "0.15-r1"
},
{
"last_affected": "0.15-r1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:0.16:r1:*:*:*:*:*:*",
"range": [
{
"introduced": "0.16-r1"
},
{
"last_affected": "0.16-r1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:0.16:r2:*:*:*:*:*:*",
"range": [
{
"introduced": "0.16-r2"
},
{
"last_affected": "0.16-r2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:0.16:r3:*:*:*:*:*:*",
"range": [
{
"introduced": "0.16-r3"
},
{
"last_affected": "0.16-r3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:1.0:r1:*:*:*:*:*:*",
"range": [
{
"introduced": "1.0-r1"
},
{
"last_affected": "1.0-r1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:1.0:r2:*:*:*:*:*:*",
"range": [
{
"introduced": "1.0-r2"
},
{
"last_affected": "1.0-r2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:1.0:r3:*:*:*:*:*:*",
"range": [
{
"introduced": "1.0-r3"
},
{
"last_affected": "1.0-r3"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:cesnet:libyang:1.0:r4:*:*:*:*:*:*",
"range": [
{
"introduced": "1.0-r4"
},
{
"last_affected": "1.0-r4"
}
],
"source": "CPE_STRING"
},
{
"range": [
{
"fixed": "6980afae2ff9fcd6d67508b0a3f694d75fd059d6"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"0.11-r1",
"0.11-r2",
"0.12-r1",
"0.12-r2",
"0.13-r1",
"0.13-r2",
"0.14-r1",
"0.15-r1",
"0.16-r1",
"0.16-r2",
"0.16-r3",
"1.0-r1",
"1.0-r2",
"1.0-r3",
"1.0-r4",
"v1.0-r4",
"v1.0-r3",
"v1.0-r2",
"v1.0-r1",
"v0.16-r2",
"v0.16-r1",
"v0.15-r1",
"v0.14-r1",
"v0.13-r2",
"v0.12-r2",
"v0.12-r1",
"v0.11-r2",
"v0.11-r1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-19334.json",
"vanir_signatures": [
{
"id": "CVE-2019-19334-0fc85d57",
"digest": {
"threshold": 0.9,
"line_hashes": [
"292995609282841363669975935046566204682",
"149517033522983099106477072070701937564",
"297297297624460440254951196547675551567",
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"274334248161745766359455477880545863750",
"199060229445835364465972116034786537046"
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},
"source": "https://github.com/cesnet/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d6",
"target": {
"file": "src/parser.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2019-19334-8e9f3d59",
"digest": {
"length": 3550,
"function_hash": "264754062392839519042860666898880122305"
},
"source": "https://github.com/cesnet/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d6",
"target": {
"file": "src/parser.c",
"function": "make_canonical"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:56:47Z"
}
}
],
"modified": "2026-10-20T13:56:47.913119560Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PETB6TVMFV5KUD4IKVP2JPLBCYHUGSAJ/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RL54JMS7XW7PI6JC4BFSNNLSX5AINQUL/",
"https://access.redhat.com/errata/RHSA-2019:4360",
"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19334",
"https://github.com/CESNET/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d6"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
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},
{
"last_affected": "31"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2019-19334",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388425,
"published_at": "2019-12-06T16:15:10.92+00:00"
}