DEBIAN-CVE-2026-33343
etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, and 3.6.9, an authenticated user with RBAC restricted permissions on key ranges can use nested transactions to bypass all key-level authorization. This allows any authenticated user with direct access to etcd to effectively ignore all key range restrictions, accessing the entire etcd data store. Kubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected. Versions 3.4.42, 3.5.28, and 3.6.9 contain a patch. If upgrading is not immediately possible, reduce exposure by treating the affected RPCs as unauthenticated in practice. Restrict network access to etcd server ports so only trusted components can connect and require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution.
DEBIAN-CVE-2026-33343
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-33343
etcd
Source reference: /affected/0/package/name
- Affected versions
- 3.4.23-4
Source reference:
/affected/0/versions3.4.23-5Source reference:
/affected/0/versions3.4.23-6Source reference:
/affected/0/versions3.4.30-1Source reference:
/affected/0/versions3.4.30-2Source reference:
/affected/0/versions3.4.30-3Source reference:
/affected/0/versions3.5.15-1Source reference:
/affected/0/versions3.5.15-2Source reference:
/affected/0/versions3.5.15-3Source reference:
/affected/0/versions3.5.15-4Source reference:
/affected/0/versions3.5.15-5Source reference:
/affected/0/versions3.5.15-6Source reference:
/affected/0/versions3.5.15-7Source reference:
/affected/0/versions3.5.16-1Source reference:
/affected/0/versions3.5.16-10Source reference:
/affected/0/versions3.5.16-11Source reference:
/affected/0/versions3.5.16-2Source reference:
/affected/0/versions3.5.16-3Source reference:
/affected/0/versions3.5.16-4Source reference:
/affected/0/versions3.5.16-5Source reference:
/affected/0/versions3.5.16-6Source reference:
/affected/0/versions3.5.16-7Source reference:
/affected/0/versions3.5.16-8Source reference:
/affected/0/versions3.5.16-9Source reference:
/affected/0/versions3.5.22-1Source reference:
/affected/0/versions3.5.22-2Source reference:
/affected/0/versions3.5.30-1~exp1Source reference:
/affected/0/versions3.5.30-1~exp2Source reference:
/affected/0/versions3.5.30-2Source reference:
/affected/0/versions3.5.5-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
etcd
Source reference: /affected/1/package/name
- Affected versions
- 3.5.16-10
Source reference:
/affected/1/versions3.5.16-11Source reference:
/affected/1/versions3.5.16-4Source reference:
/affected/1/versions3.5.16-5Source reference:
/affected/1/versions3.5.16-6Source reference:
/affected/1/versions3.5.16-7Source reference:
/affected/1/versions3.5.16-8Source reference:
/affected/1/versions3.5.16-9Source reference:
/affected/1/versions3.5.22-1Source reference:
/affected/1/versions3.5.22-2Source reference:
/affected/1/versions3.5.30-1~exp1Source reference:
/affected/1/versions3.5.30-1~exp2Source reference:
/affected/1/versions3.5.30-2Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
etcd
Source reference: /affected/2/package/name
- Affected versions
- 3.5.16-10
Source reference:
/affected/2/versions3.5.16-4Source reference:
/affected/2/versions3.5.16-5Source reference:
/affected/2/versions3.5.16-6Source reference:
/affected/2/versions3.5.16-7Source reference:
/affected/2/versions3.5.16-8Source reference:
/affected/2/versions3.5.16-9Source reference:
/affected/2/versions - Fixed versions
- 3.5.16-11
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "etcd",
"purl": "pkg:deb/debian/etcd?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.4.23-4",
"3.4.23-5",
"3.4.23-6",
"3.4.30-1",
"3.4.30-2",
"3.4.30-3",
"3.5.15-1",
"3.5.15-2",
"3.5.15-3",
"3.5.15-4",
"3.5.15-5",
"3.5.15-6",
"3.5.15-7",
"3.5.16-1",
"3.5.16-10",
"3.5.16-11",
"3.5.16-2",
"3.5.16-3",
"3.5.16-4",
"3.5.16-5",
"3.5.16-6",
"3.5.16-7",
"3.5.16-8",
"3.5.16-9",
"3.5.22-1",
"3.5.22-2",
"3.5.30-1~exp1",
"3.5.30-1~exp2",
"3.5.30-2",
"3.5.5-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33343.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "etcd",
"purl": "pkg:deb/debian/etcd?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.5.16-10",
"3.5.16-11",
"3.5.16-4",
"3.5.16-5",
"3.5.16-6",
"3.5.16-7",
"3.5.16-8",
"3.5.16-9",
"3.5.22-1",
"3.5.22-2",
"3.5.30-1~exp1",
"3.5.30-1~exp2",
"3.5.30-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33343.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.16-11"
}
]
}
],
"package": {
"name": "etcd",
"purl": "pkg:deb/debian/etcd?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.5.16-10",
"3.5.16-4",
"3.5.16-5",
"3.5.16-6",
"3.5.16-7",
"3.5.16-8",
"3.5.16-9"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33343.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56772 · Revision 1
- Added to Heist Feed
- Publisher date