High
iperf3 — security advisory
iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.
- Products
- iperf3
- Affected versions
- 3.0.11-1, 3.0.11-1ubuntu0.1~esm1, 3.0.11-1ubuntu0.1~esm2, 3.1.3-1, 3.1.3-1ubuntu0.1~esm1, 3.14-1, 3.15-1, 3.16-1, 3.16-1build1, 3.16-1build2, 3.16-1ubuntu0.1~esm1, 3.18-2, 3.19.1-2, 3.20-2, 3.20-2.1, 3.20-2.1build1, 3.6-2, 3.7-1, 3.7-2, 3.7-3, 3.7-3ubuntu0.1~esm1, 3.7-3ubuntu0.1~esm2, 3.9-1, 3.9-1+deb11u1build0.22.04.1, 3.9-1+deb11u1ubuntu0.1, 3.9-1+deb11u1ubuntu0.1~esm1, 3.9-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-102253
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:53 UTC · Revision 1
Source evidence
iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.
osv:UBUNTU-CVE-2026-102253
iperf3
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
Complete source record
{
"id": "3a0a41d8f78e7fbb01cfb692fb56a7284973fef9a7f9e09f4399daa8fcd723a8",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-102253",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-102253",
"summary": "iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.",
"evidence": "osv:UBUNTU-CVE-2026-102253",
"products": [
{
"name": {
"value": "iperf3",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.0.11-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.11-1ubuntu0.1~esm1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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]
},
{
"name": {
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{
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"evidence": "/affected/1/versions"
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{
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{
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{
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},
{
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"evidence": "/affected/2/versions"
},
{
"value": "3.7-3",
"evidence": "/affected/2/versions"
},
{
"value": "3.7-3ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
},
{
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},
{
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"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
},
{
"value": "3.9-1+deb11u1build0.22.04.1",
"evidence": "/affected/3/versions"
},
{
"value": "3.9-1+deb11u1ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
},
{
"value": "3.9-1+deb11u1ubuntu0.1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "3.14-1",
"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
},
{
"value": "3.16-1",
"evidence": "/affected/4/versions"
},
{
"value": "3.16-1build1",
"evidence": "/affected/4/versions"
},
{
"value": "3.16-1build2",
"evidence": "/affected/4/versions"
},
{
"value": "3.16-1ubuntu0.1~esm1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "iperf3",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.20-2",
"evidence": "/affected/5/versions"
},
{
"value": "3.20-2.1",
"evidence": "/affected/5/versions"
},
{
"value": "3.20-2.1build1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "iperf3",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.18-2",
"evidence": "/affected/6/versions"
},
{
"value": "3.19.1-2",
"evidence": "/affected/6/versions"
},
{
"value": "3.20-2",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-102253",
"aliases": [
"UBUNTU-CVE-2026-102253"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"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:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "iperf3",
"purl": "pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"3.0.11-1",
"3.0.11-1ubuntu0.1~esm1",
"3.0.11-1ubuntu0.1~esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102253.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "iperf3",
"binary_version": "3.0.11-1ubuntu0.1~esm2"
},
{
"binary_name": "libiperf0",
"binary_version": "3.0.11-1ubuntu0.1~esm2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "iperf3",
"purl": "pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"3.1.3-1",
"3.1.3-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102253.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "iperf3",
"binary_version": "3.1.3-1ubuntu0.1~esm1"
},
{
"binary_name": "libiperf0",
"binary_version": "3.1.3-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "iperf3",
"purl": "pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"3.6-2",
"3.7-1",
"3.7-2",
"3.7-3",
"3.7-3ubuntu0.1~esm1",
"3.7-3ubuntu0.1~esm2"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "iperf3",
"binary_version": "3.7-3ubuntu0.1~esm2"
},
{
"binary_name": "libiperf0",
"binary_version": "3.7-3ubuntu0.1~esm2"
}
]
}
},
{
"ranges": [
{
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{
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}
]
}
],
"package": {
"name": "iperf3",
"purl": "pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"3.9-1",
"3.9-1build1",
"3.9-1+deb11u1build0.22.04.1",
"3.9-1+deb11u1ubuntu0.1~esm1",
"3.9-1+deb11u1ubuntu0.1"
],
"database_specific": {
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},
"ecosystem_specific": {
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{
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},
{
"binary_name": "libiperf0",
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}
]
}
},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fnoble",
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},
{
"binary_name": "libiperf0",
"binary_version": "3.16-1ubuntu0.1~esm1"
}
]
}
},
{
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],
"package": {
"name": "iperf3",
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"ecosystem": "Ubuntu:26.10"
},
"versions": [
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"3.20-2.1",
"3.20-2.1build1"
],
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},
"ecosystem_specific": {
"binaries": [
{
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},
{
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}
]
}
},
{
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"package": {
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"3.18-2",
"3.19.1-2",
"3.20-2"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "iperf3",
"binary_version": "3.20-2"
},
{
"binary_name": "libiperf0",
"binary_version": "3.20-2"
}
]
}
}
],
"modified": "2026-10-17T12:59:46.069316147Z",
"provider": "osv",
"upstream": [
"CVE-2026-102253"
],
"references": [
"https://ubuntu.com/security/CVE-2026-102253",
"https://www.cve.org/CVERecord?id=CVE-2026-102253",
"https://github.com/esnet/iperf/blob/master/RELNOTES.md",
"https://github.com/esnet/iperf/releases/tag/3.22",
"https://www.vulncheck.com/advisories/iperf3-udp-receive-worker-infinite-loop-dos"
]
},
"related_cves": [
{
"value": "CVE-2026-102253",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 359752,
"published_at": "2026-09-29T21:17:00+00:00"
}