High
rsync — security advisory
rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthenticated remote attackers to exhaust daemon connection slots by stalling the handshake process before or after module selection without triggering the I/O timeout. Attackers can open many simultaneous connections and trickle data at the minimum rate to avoid timeout, or stall entirely before module selection where no timeout applies, consuming all available connection slots and denying service to legitimate clients.
- Products
- rsync
- Affected versions
- 3.0.9-4ubuntu1, 3.1.0-2, 3.1.0-2ubuntu0.1, 3.1.0-2ubuntu0.2, 3.1.0-2ubuntu0.3, 3.1.0-2ubuntu0.4, 3.1.0-2ubuntu0.4+esm1, 3.1.0-2ubuntu0.4+esm2, 3.1.0-2ubuntu0.4+esm3, 3.1.0-2ubuntu0.4+esm4, 3.1.1-3, 3.1.1-3ubuntu1, 3.1.1-3ubuntu1.1, 3.1.1-3ubuntu1.2, 3.1.1-3ubuntu1.3, 3.1.1-3ubuntu1.3+esm1, 3.1.1-3ubuntu1.3+esm2, 3.1.1-3ubuntu1.3+esm3, 3.1.1-3ubuntu1.3+esm4, 3.1.1-3ubuntu1.3+esm5, 3.1.1-3ubuntu1.3+esm6, 3.1.2-2, 3.1.2-2.1, 3.1.2-2.1ubuntu1, 3.1.2-2.1ubuntu1.1, 3.1.2-2.1ubuntu1.2, 3.1.2-2.1ubuntu1.3, 3.1.2-2.1ubuntu1.4, 3.1.2-2.1ubuntu1.5, 3.1.2-2.1ubuntu1.6, 3.1.2-2.1ubuntu1.6+esm1, 3.1.2-2.1ubuntu1.6+esm2, 3.1.2-2.1ubuntu1.6+esm3, 3.1.2-2.1ubuntu1.6+esm4, 3.1.3-6, 3.1.3-8, 3.1.3-8ubuntu0.1, 3.1.3-8ubuntu0.2, 3.1.3-8ubuntu0.3, 3.1.3-8ubuntu0.4, 3.1.3-8ubuntu0.5, 3.1.3-8ubuntu0.7, 3.1.3-8ubuntu0.8, 3.1.3-8ubuntu0.9, 3.1.3-8ubuntu0.9+esm1, 3.1.3-8ubuntu0.9+esm2, 3.2.3-4ubuntu1, 3.2.3-4ubuntu2, 3.2.3-8ubuntu1, 3.2.3-8ubuntu2, 3.2.3-8ubuntu3, 3.2.3-8ubuntu3.1, 3.2.7-0ubuntu0.22.04.2, 3.2.7-0ubuntu0.22.04.3, 3.2.7-0ubuntu0.22.04.4, 3.2.7-0ubuntu0.22.04.6, 3.2.7-0ubuntu0.22.04.7, 3.2.7-1, 3.2.7-1build1, 3.2.7-1build2, 3.2.7-1ubuntu1, 3.2.7-1ubuntu1.1, 3.2.7-1ubuntu1.2, 3.2.7-1ubuntu1.4, 3.2.7-1ubuntu1.5, 3.4.1+ds1-5ubuntu1, 3.4.1+ds1-6, 3.4.1+ds1-7, 3.4.1+ds1-7ubuntu0.2, 3.4.1+ds1-7ubuntu0.3, 3.4.4+ds1-1, 3.4.4+ds1-1build1, 3.5.0+ds1-2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-70464
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:51 UTC · Revision 1
Source evidence
rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthenticated remote attackers to exhaust daemon connection slots by stalling the handshake process before or after module selection without triggering the I/O timeout. Attackers can open many simultaneous connections and trickle data at the minimum rate to avoid timeout, or stall entirely before module selection where no timeout applies, consuming all available connection slots and denying service to legitimate clients.
osv:UBUNTU-CVE-2026-70464
rsync
Fixed versions: Not specified
rsync
Fixed versions: Not specified
rsync
Fixed versions: Not specified
rsync
Fixed versions: Not specified
rsync
Fixed versions: Not specified
rsync
Fixed versions: Not specified
rsync
Fixed versions: Not specified
rsync
Fixed versions: Not specified
Complete source record
{
"id": "4e06b291debb626593abdcf452c236cdc97969b71b71376ed5955478cd7bc83d",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-70464",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-70464",
"summary": "rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthenticated remote attackers to exhaust daemon connection slots by stalling the handshake process before or after module selection without triggering the I/O timeout. Attackers can open many simultaneous connections and trickle data at the minimum rate to avoid timeout, or stall entirely before module selection where no timeout applies, consuming all available connection slots and denying service to legitimate clients.",
"evidence": "osv:UBUNTU-CVE-2026-70464",
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},
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{
"value": "3.0.9-4ubuntu1",
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},
{
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"evidence": "/affected/0/versions"
},
{
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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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{
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{
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"evidence": "/affected/1/versions"
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{
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{
"name": {
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{
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{
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{
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{
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{
"value": "3.1.2-2.1ubuntu1.2",
"evidence": "/affected/2/versions"
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{
"value": "3.1.2-2.1ubuntu1.3",
"evidence": "/affected/2/versions"
},
{
"value": "3.1.2-2.1ubuntu1.4",
"evidence": "/affected/2/versions"
},
{
"value": "3.1.2-2.1ubuntu1.5",
"evidence": "/affected/2/versions"
},
{
"value": "3.1.2-2.1ubuntu1.6",
"evidence": "/affected/2/versions"
},
{
"value": "3.1.2-2.1ubuntu1.6+esm1",
"evidence": "/affected/2/versions"
},
{
"value": "3.1.2-2.1ubuntu1.6+esm2",
"evidence": "/affected/2/versions"
},
{
"value": "3.1.2-2.1ubuntu1.6+esm3",
"evidence": "/affected/2/versions"
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{
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},
{
"name": {
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},
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"affected_versions": [
{
"value": "3.1.3-6",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.3-8",
"evidence": "/affected/3/versions"
},
{
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{
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{
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{
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{
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{
"value": "3.1.3-8ubuntu0.7",
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},
{
"value": "3.1.3-8ubuntu0.8",
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},
{
"value": "3.1.3-8ubuntu0.9",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.3-8ubuntu0.9+esm1",
"evidence": "/affected/3/versions"
},
{
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{
"value": "3.2.3-4ubuntu1",
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},
{
"value": "3.2.3-4ubuntu2",
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},
{
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{
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{
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{
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{
"value": "3.2.7-0ubuntu0.22.04.4",
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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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},
{
"value": "3.4.4+ds1-1",
"evidence": "/affected/6/versions"
},
{
"value": "3.4.4+ds1-1build1",
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{
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{
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{
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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:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
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},
{
"type": "Ubuntu",
"score": "medium"
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},
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},
"ecosystem_specific": {
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},
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},
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],
"database_specific": {
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},
"ecosystem_specific": {
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},
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"3.2.7-1build1",
"3.2.7-1build2",
"3.2.7-1ubuntu1",
"3.2.7-1ubuntu1.1",
"3.2.7-1ubuntu1.2",
"3.2.7-1ubuntu1.4",
"3.2.7-1ubuntu1.5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-70464.json"
},
"ecosystem_specific": {
"binaries": [
{
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"binary_version": "3.2.7-1ubuntu1.5"
}
]
}
},
{
"ranges": [
{
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"events": [
{
"introduced": "0"
}
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}
],
"package": {
"name": "rsync",
"purl": "pkg:deb/ubuntu/rsync?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"3.4.1+ds1-7",
"3.4.4+ds1-1",
"3.4.4+ds1-1build1",
"3.5.0+ds1-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-70464.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rsync",
"binary_version": "3.5.0+ds1-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "rsync",
"purl": "pkg:deb/ubuntu/rsync?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"3.4.1+ds1-5ubuntu1",
"3.4.1+ds1-6",
"3.4.1+ds1-7",
"3.4.1+ds1-7ubuntu0.2",
"3.4.1+ds1-7ubuntu0.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-70464.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rsync",
"binary_version": "3.4.1+ds1-7ubuntu0.3"
}
]
}
}
],
"modified": "2026-10-17T12:59:27.576944581Z",
"provider": "osv",
"upstream": [
"CVE-2026-70464"
],
"references": [
"https://ubuntu.com/security/CVE-2026-70464",
"https://www.cve.org/CVERecord?id=CVE-2026-70464",
"https://download.samba.org/pub/rsync/NEWS#3.5.0"
]
},
"related_cves": [
{
"value": "CVE-2026-70464",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 359659,
"published_at": "2026-08-13T15:20:00+00:00"
}