UnratedFix available
openvpn vulnerabilities
Type: advisorySources: OSV
It was discovered that OpenVPN had a use-after-free vulnerability in its TLS session handling. An attacker could possibly use this issue to cause OpenVPN to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-84471) It was discovered that OpenVPN incorrectly handled retransmissions of ACK packet IDs, which could trigger a timeout integer overflow. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-84732)
- Products
- openvpn
- Affected versions
- 2.5.1-3ubuntu1, 2.5.1-3ubuntu2, 2.5.1-3ubuntu4, 2.5.1-3ubuntu5, 2.5.11-0ubuntu0.22.04.1, 2.5.11-0ubuntu0.22.04.3, 2.5.11-0ubuntu0.22.04.4, 2.5.5-1ubuntu1, 2.5.5-1ubuntu3, 2.5.5-1ubuntu3.1, 2.5.9-0ubuntu0.22.04.2, 2.5.9-0ubuntu0.22.04.3, 2.6.12-0ubuntu0.24.04.1, 2.6.12-0ubuntu0.24.04.3, 2.6.14-0ubuntu0.24.04.1, 2.6.14-0ubuntu0.24.04.2, 2.6.14-0ubuntu0.24.04.3, 2.6.14-2ubuntu1, 2.6.15-1ubuntu1, 2.6.19-0ubuntu0.24.04.1, 2.6.19-0ubuntu0.24.04.2, 2.6.19-0ubuntu0.24.04.3, 2.6.5-0ubuntu1, 2.6.7-1ubuntu1, 2.6.9-1ubuntu2, 2.6.9-1ubuntu3, 2.6.9-1ubuntu4, 2.6.9-1ubuntu4.1, 2.7.0-1ubuntu1, 2.7.0-1ubuntu1.1, 2.7.0-1ubuntu1.2, 2.7.0~rc5-1ubuntu5, 2.7.0~rc6-1ubuntu1
- Fixed versions
- 2.5.11-0ubuntu0.22.04.5, 2.6.19-0ubuntu0.24.04.4, 2.7.0-1ubuntu1.3
- CVEs
- CVE-2026-84471, CVE-2026-84732
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:31 UTC · Revision 1
Source evidence
It was discovered that OpenVPN had a use-after-free vulnerability in its TLS session handling. An attacker could possibly use this issue to cause OpenVPN to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-84471) It was discovered that OpenVPN incorrectly handled retransmissions of ACK packet IDs, which could trigger a timeout integer overflow. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-84732)
osv:USN-8852-1
openvpn
Fixed versions: 2.5.11-0ubuntu0.22.04.5
openvpn
Fixed versions: 2.6.19-0ubuntu0.24.04.4
openvpn
Fixed versions: 2.7.0-1ubuntu1.3
Complete source record
{
"id": "7ba1bab16abba7bfb47d79820881a831e9e9a6c2d0c4696b80311ba49623c73b",
"url": "https://osv.dev/vulnerability/USN-8852-1",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "openvpn vulnerabilities",
"summary": "It was discovered that OpenVPN had a use-after-free vulnerability in its TLS session handling. An attacker could possibly use this issue to cause OpenVPN to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-84471) It was discovered that OpenVPN incorrectly handled retransmissions of ACK packet IDs, which could trigger a timeout integer overflow. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-84732)",
"evidence": "osv:USN-8852-1",
"products": [
{
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"evidence": "/affected/0/package/name"
},
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{
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"evidence": "/affected/0/ranges"
}
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"affected_versions": [
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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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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{
"value": "2.6.9-1ubuntu4.1",
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{
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{
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{
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{
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{
"value": "2.6.19-0ubuntu0.24.04.2",
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{
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{
"name": {
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},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.0-1ubuntu1.3",
"evidence": "/affected/2/ranges"
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],
"affected_versions": [
{
"value": "2.6.14-2ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "2.6.15-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "2.7.0~rc5-1ubuntu5",
"evidence": "/affected/2/versions"
},
{
"value": "2.7.0~rc6-1ubuntu1",
"evidence": "/affected/2/versions"
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{
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{
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},
{
"value": "2.7.0-1ubuntu1.2",
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}
]
}
],
"severity": "unknown",
"structured": {
"id": "USN-8852-1",
"aliases": [
"USN-8852-1"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "2.5.11-0ubuntu0.22.04.5"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:deb/ubuntu/openvpn?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"2.5.1-3ubuntu1",
"2.5.1-3ubuntu2",
"2.5.1-3ubuntu4",
"2.5.1-3ubuntu5",
"2.5.5-1ubuntu1",
"2.5.5-1ubuntu3",
"2.5.5-1ubuntu3.1",
"2.5.9-0ubuntu0.22.04.2",
"2.5.9-0ubuntu0.22.04.3",
"2.5.11-0ubuntu0.22.04.1",
"2.5.11-0ubuntu0.22.04.3",
"2.5.11-0ubuntu0.22.04.4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8852-1.json",
"cves_map": {
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{
"id": "CVE-2026-84471",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-84732",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openvpn",
"binary_version": "2.5.11-0ubuntu0.22.04.5"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.6.19-0ubuntu0.24.04.4"
}
]
}
],
"package": {
"name": "openvpn",
"purl": "pkg:deb/ubuntu/openvpn?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"2.6.5-0ubuntu1",
"2.6.7-1ubuntu1",
"2.6.9-1ubuntu2",
"2.6.9-1ubuntu3",
"2.6.9-1ubuntu4",
"2.6.9-1ubuntu4.1",
"2.6.12-0ubuntu0.24.04.1",
"2.6.12-0ubuntu0.24.04.3",
"2.6.14-0ubuntu0.24.04.1",
"2.6.14-0ubuntu0.24.04.2",
"2.6.14-0ubuntu0.24.04.3",
"2.6.19-0ubuntu0.24.04.1",
"2.6.19-0ubuntu0.24.04.2",
"2.6.19-0ubuntu0.24.04.3"
],
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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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},
{
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"package": {
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},
{
"type": "Ubuntu",
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]
},
{
"id": "CVE-2026-84732",
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{
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"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"
},
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]
}
],
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}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openvpn",
"binary_version": "2.7.0-1ubuntu1.3"
}
],
"availability": "No subscription required"
}
}
],
"modified": "2026-10-17T12:55:34.283484800Z",
"provider": "osv",
"upstream": [
"CVE-2026-84471",
"CVE-2026-84732",
"UBUNTU-CVE-2026-84471",
"UBUNTU-CVE-2026-84732"
],
"references": [
"https://ubuntu.com/security/notices/USN-8852-1",
"https://ubuntu.com/security/CVE-2026-84471",
"https://ubuntu.com/security/CVE-2026-84732"
]
},
"related_cves": [
{
"value": "CVE-2026-84471",
"evidence": "/upstream"
},
{
"value": "CVE-2026-84732",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 353885,
"published_at": "2026-09-30T11:53:54+00:00"
}