UBUNTU-CVE-2026-73500
- Source
- https://ubuntu.com/security/CVE-2026-73500
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73500.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-73500
- Upstream
- Published
- 2026-08-13T00:00:00Z
- Modified
- 2026-08-13T19:31:02.703887451Z
- Severity
-
- 8.7 (High) CVSS_V4 - 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 CVSS Calculator
- Ubuntu - medium
- Summary
- [none]
- Details
-
etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a network attacker who can reach an etcd TLS listener can open many TCP connections and never send a ClientHello. In client/pkg/transport/listener_tls.go, each connection handled by tlsListener.acceptLoop spawns a goroutine that blocks indefinitely inside tls.Conn.Handshake() and remains tracked in the pending map. Unbounded goroutine and map growth can exhaust memory in the etcd process, causing loss of availability for the cluster and, when etcd backs Kubernetes, the control plane. This issue is fixed in versions 3.5.33, 3.6.14, and 3.7.1.
- References
-
- https://ubuntu.com/security/CVE-2026-73500
- https://www.cve.org/CVERecord?id=CVE-2026-73500
- https://github.com/etcd-io/etcd/security/advisories/GHSA-6vch-q96h-7gc3
- https://github.com/etcd-io/etcd/pull/22130
- https://github.com/etcd-io/etcd/commit/2e07efce9745004eb4773cffaada9b5cdf77cff2
- https://github.com/etcd-io/etcd/commit/89ff6d50796049d4f1136915ba21504b76e7e372
- https://github.com/etcd-io/etcd/commit/8e4dd0679a2c6b095d2a32a749fda2521c7809a3
- https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057
- https://github.com/etcd-io/etcd/releases/tag/v3.5.33
- https://github.com/etcd-io/etcd/releases/tag/v3.6.14
- https://github.com/etcd-io/etcd/releases/tag/v3.7.1
Affected packages
Ubuntu:16.04:LTS
etcd
Package
- Name
- etcd
- Purl
- pkg:deb/ubuntu/etcd?arch=source&distro=xenial
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
2.*
2.2.0+dfsg-2
2.2.1+dfsg-1
2.2.2+dfsg-1
2.2.2+dfsg-2
2.2.3+dfsg-1
2.2.5+dfsg-1
2.2.5+dfsg-1ubuntu1
Ubuntu:Pro:18.04:LTS
etcd
Package
- Name
- etcd
- Purl
- pkg:deb/ubuntu/etcd?arch=source&distro=esm-apps%2Fbionic
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
3.*
3.1.0-1
3.2.9+dfsg-2
3.2.9+dfsg-3
3.2.17+dfsg-1
3.2.17+dfsg-1ubuntu0.1~esm1
3.2.17+dfsg-1ubuntu0.1
3.2.17+dfsg-1ubuntu0.1+esm1
3.2.17+dfsg-1ubuntu0.1+esm2
Ecosystem specific
{
"binaries": [
{
"binary_version": "3.2.17+dfsg-1ubuntu0.1+esm2",
"binary_name": "etcd"
},
{
"binary_version": "3.2.17+dfsg-1ubuntu0.1+esm2",
"binary_name": "etcd-client"
},
{
"binary_version": "3.2.17+dfsg-1ubuntu0.1+esm2",
"binary_name": "etcd-server"
},
{
"binary_version": "3.2.17+dfsg-1ubuntu0.1+esm2",
"binary_name": "golang-etcd-server-dev"
}
]
}Ubuntu:Pro:20.04:LTS
etcd
Package
- Name
- etcd
- Purl
- pkg:deb/ubuntu/etcd?arch=source&distro=esm-apps%2Ffocal
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
3.*
3.2.26+dfsg-3
3.2.26+dfsg-4
3.2.26+dfsg-6
3.2.26+dfsg-6ubuntu0.1
3.2.26+dfsg-6ubuntu0.2
3.2.26+dfsg-6ubuntu0.2+esm1
Ecosystem specific
{
"binaries": [
{
"binary_version": "3.2.26+dfsg-6ubuntu0.2+esm1",
"binary_name": "etcd"
},
{
"binary_version": "3.2.26+dfsg-6ubuntu0.2+esm1",
"binary_name": "etcd-client"
},
{
"binary_version": "3.2.26+dfsg-6ubuntu0.2+esm1",
"binary_name": "etcd-server"
},
{
"binary_version": "3.2.26+dfsg-6ubuntu0.2+esm1",
"binary_name": "golang-etcd-server-dev"
}
]
}Ubuntu:Pro:22.04:LTS
etcd
Package
- Name
- etcd
- Purl
- pkg:deb/ubuntu/etcd?arch=source&distro=esm-apps%2Fjammy
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
3.*
3.3.25+dfsg-6
3.3.25+dfsg-7
3.3.25+dfsg-7ubuntu0.22.04.1
3.3.25+dfsg-7ubuntu0.22.04.1+esm1
3.3.25+dfsg-7ubuntu0.22.04.2
3.3.25+dfsg-7ubuntu0.22.04.2+esm1
3.3.25+dfsg-7ubuntu0.22.04.2+esm2
3.3.25+dfsg-7ubuntu0.22.04.2+esm3
Ecosystem specific
{
"binaries": [
{
"binary_version": "3.3.25+dfsg-7ubuntu0.22.04.2+esm3",
"binary_name": "etcd"
},
{
"binary_version": "3.3.25+dfsg-7ubuntu0.22.04.2+esm3",
"binary_name": "etcd-client"
},
{
"binary_version": "3.3.25+dfsg-7ubuntu0.22.04.2+esm3",
"binary_name": "etcd-server"
},
{
"binary_version": "3.3.25+dfsg-7ubuntu0.22.04.2+esm3",
"binary_name": "golang-etcd-server-dev"
}
]
}Ubuntu:Pro:24.04:LTS
etcd
Package
- Name
- etcd
- Purl
- pkg:deb/ubuntu/etcd?arch=source&distro=esm-apps%2Fnoble
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Affected versions
3.*
3.4.23-4ubuntu2
3.4.30-1
3.4.30-1build1
3.4.30-1ubuntu0.24.04.1
3.4.30-1ubuntu0.24.04.2
3.4.30-1ubuntu0.24.04.2+esm1
3.4.30-1ubuntu0.24.04.3
3.4.30-1ubuntu0.24.04.3+esm1
3.4.30-1ubuntu0.24.04.3+esm2
Ecosystem specific
{
"binaries": [
{
"binary_version": "3.4.30-1ubuntu0.24.04.3+esm2",
"binary_name": "etcd-client"
},
{
"binary_version": "3.4.30-1ubuntu0.24.04.3+esm2",
"binary_name": "etcd-server"
},
{
"binary_version": "3.4.30-1ubuntu0.24.04.3+esm2",
"binary_name": "golang-etcd-server-dev"
}
]
}Ubuntu:Pro:26.04:LTS
etcd
Package
- Name
- etcd
- Purl
- pkg:deb/ubuntu/etcd?arch=source&distro=esm-apps%2Fresolute
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Ecosystem specific
{
"binaries": [
{
"binary_version": "3.5.16-10ubuntu0.26.04.1~esm1",
"binary_name": "etcd-client"
},
{
"binary_version": "3.5.16-10ubuntu0.26.04.1~esm1",
"binary_name": "etcd-server"
},
{
"binary_version": "3.5.16-10ubuntu0.26.04.1~esm1",
"binary_name": "golang-etcd-server-dev"
}
]
}