High
ovn — security advisory
A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets with an inflated Client ID length, could cause the ovn-controller to read beyond the bounds of a packet. This out-of-bounds read can lead to the disclosure of sensitive information stored in heap memory, which is then returned to the attacker's virtual machine port.
- Products
- ovn
- Affected versions
- 2.12.90~git20200107.c80e014d4-0ubuntu1, 2.12.90~git20200107.c80e014d4-0ubuntu2, 20.03.0-0ubuntu1, 20.03.0~git20200212.9a4e68ec8-0ubuntu1, 20.03.0~git20200212.9a4e68ec8-0ubuntu3, 20.03.1-0ubuntu1, 20.03.1-0ubuntu1.1, 20.03.1-0ubuntu1.2, 20.03.2-0ubuntu0.20.04.1, 20.03.2-0ubuntu0.20.04.2, 20.03.2-0ubuntu0.20.04.3, 20.03.2-0ubuntu0.20.04.4, 20.03.2-0ubuntu0.20.04.5, 20.03.2-0ubuntu0.20.04.6, 21.09.0-0ubuntu2, 21.09.0~git20210922.6549e5842-0ubuntu1, 21.09.0~git20210922.6549e5842-0ubuntu2, 21.12.0-0ubuntu1, 22.03.0-0ubuntu1, 22.03.0~git20220218.ed81be7-0ubuntu1, 22.03.2-0ubuntu0.22.04.1, 22.03.3-0ubuntu0.22.04.1, 22.03.3-0ubuntu0.22.04.2, 22.03.3-0ubuntu0.22.04.3, 22.03.3-0ubuntu0.22.04.5, 22.03.8-0ubuntu0.22.04.1, 23.09.0-1, 23.09.0-2, 24.03.0~git20240205.ebb7076-1, 24.03.1-2ubuntu1, 24.03.1-2ubuntu3, 24.03.2-0ubuntu0.24.04.1, 24.03.2-0ubuntu0.24.04.2, 24.03.6-0ubuntu0.24.04.1, 24.03.8-0ubuntu0.24.04.1, 25.03.0-1, 25.09.0-1, 25.09.0-3, 25.09.0~git20250813.23884f5-maysync1, 26.03.0-2, 26.03.0-6, 26.03.0~git20260216.b543a88-2, 26.03.1-1, 26.09.0-1, 26.09.0~git20260819.c60a7af-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-5367
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:08 UTC · Revision 1
Source evidence
A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets with an inflated Client ID length, could cause the ovn-controller to read beyond the bounds of a packet. This out-of-bounds read can lead to the disclosure of sensitive information stored in heap memory, which is then returned to the attacker's virtual machine port.
osv:UBUNTU-CVE-2026-5367
ovn
Fixed versions: Not specified
ovn
Fixed versions: Not specified
ovn
Fixed versions: Not specified
ovn
Fixed versions: Not specified
ovn
Fixed versions: Not specified
ovn
Fixed versions: Not specified
Complete source record
{
"id": "71c4872fb53352280043829ff691ba301704dc1fa29cce1a4e420b29621c5c1a",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-5367",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-5367",
"summary": "A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets with an inflated Client ID length, could cause the ovn-controller to read beyond the bounds of a packet. This out-of-bounds read can lead to the disclosure of sensitive information stored in heap memory, which is then returned to the attacker's virtual machine port.",
"evidence": "osv:UBUNTU-CVE-2026-5367",
"products": [
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
"name": {
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"evidence": "/affected/2/package/name"
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"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "23.09.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "23.09.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.0~git20240205.ebb7076-1",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.1-2ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.1-2ubuntu3",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.2-0ubuntu0.24.04.1",
"evidence": "/affected/2/versions"
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{
"value": "24.03.2-0ubuntu0.24.04.2",
"evidence": "/affected/2/versions"
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{
"value": "24.03.6-0ubuntu0.24.04.1",
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},
{
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}
]
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
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"affected_versions": [
{
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"evidence": "/affected/3/versions"
},
{
"value": "25.09.0~git20250813.23884f5-maysync1",
"evidence": "/affected/3/versions"
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{
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},
{
"name": {
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"evidence": "/affected/4/package/name"
},
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"affected_versions": [
{
"value": "26.03.0-2",
"evidence": "/affected/4/versions"
},
{
"value": "26.03.0-6",
"evidence": "/affected/4/versions"
},
{
"value": "26.03.1-1",
"evidence": "/affected/4/versions"
},
{
"value": "26.09.0~git20260819.c60a7af-1",
"evidence": "/affected/4/versions"
},
{
"value": "26.09.0-1",
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}
]
},
{
"name": {
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},
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"evidence": "/affected/5/versions"
},
{
"value": "25.09.0-3",
"evidence": "/affected/5/versions"
},
{
"value": "26.03.0~git20260216.b543a88-2",
"evidence": "/affected/5/versions"
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{
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],
"severity": "high",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
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},
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},
{
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{
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{
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{
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{
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"24.03.6-0ubuntu0.24.04.1",
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},
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{
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{
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{
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},
{
"binary_name": "ovn-docker",
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{
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{
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{
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},
{
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},
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},
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{
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},
"ecosystem_specific": {
"binaries": [
{
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},
{
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{
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{
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},
{
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},
{
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},
{
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}
]
}
}
],
"modified": "2026-10-17T13:00:25.489820266Z",
"provider": "osv",
"upstream": [
"CVE-2026-5367"
],
"references": [
"https://ubuntu.com/security/CVE-2026-5367",
"https://www.cve.org/CVERecord?id=CVE-2026-5367"
]
},
"related_cves": [
{
"value": "CVE-2026-5367",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360527,
"published_at": "2026-04-20T00:00:00+00:00"
}