HighFix available
libyang, libyang2 — security advisory
libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15.
- Products
- libyang, libyang2
- Affected versions
- 2.1.148-0.1, 2.1.148-0.2, 2.1.30-2, 2.1.30-2.1, 2.1.30-2.1~exp1, 3.12.2-1, 3.13.5-1, 3.13.5-2, 3.13.6-1, 3.13.6-1~bpo13+1, 4.2.2-1, 4.2.2-2, 4.2.2-3, 4.3.3-1, 4.3.4-1, 4.7.3-1, 5.0.2-1, 5.0.8-1, 5.4.1+really5.4.1-1, 5.4.1-1, 5.4.5-1, 5.4.9-1, 5.7.1-1, 5.8.5-1, 5.8.6-1, 5.8.6-2, 6.1.4-1, 6.4.13-1, 6.4.3-1, 6.4.6-1
- Fixed versions
- 6.4.13-1
- CVEs
- CVE-2026-44673
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:49 UTC · Revision 1
Source evidence
libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15.
osv:DEBIAN-CVE-2026-44673
libyang
Fixed versions: Not specified
libyang
Fixed versions: 6.4.13-1
libyang2
Fixed versions: Not specified
Complete source record
{
"id": "35f551ec49696433223fb030396efb2642e22d9b3ac790736b39d1fb35801555",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-44673",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-44673",
"summary": "libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15.",
"evidence": "osv:DEBIAN-CVE-2026-44673",
"products": [
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{
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{
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"evidence": "/affected/2/versions"
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{
"value": "2.1.30-2",
"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
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{
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],
"severity": "high",
"structured": {
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"aliases": [
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"metrics": [
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"affected": [
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],
"modified": "2026-10-27T09:47:36.715340515Z",
"provider": "osv",
"upstream": [
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],
"references": [
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]
},
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"evidence": "/upstream"
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},
"source_id": "core-osv",
"document_id": 461299,
"published_at": "2026-05-14T21:16:47.5+00:00"
}