NVD - CVE-2026-33343 (original) (raw)
CVE-2026-33343 Detail
Description
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.
Metrics
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:
NIST: NVD
N/A
NVD assessment not yet provided.
CVSS 3.x Severity and Vector Strings:
NIST: NVD
Base Score: 6.5 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA: GitHub, Inc.
Base Score: 0.0 NONE
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
CVSS 2.0 Severity and Vector Strings:
NIST: NVD
Base Score: N/A
NVD assessment not yet provided.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/etcd-io/etcd/security/advisories/GHSA-rfx7-8w68-q57q | GitHub, Inc. | Mitigation Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-863 | Incorrect Authorization | GitHub, Inc. |
Known Affected Software Configurations Switch to CPE 2.2
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Change History
2 change records found show changes
Initial Analysis by NIST 3/26/2026 4:41:35 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | CVSS V3.1 | AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | |
| Added | CPE Configuration | OR *cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:* versions up to (excluding) 3.4.42 *cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:* versions from (including) 3.5.0 up to (excluding) 3.5.28 *cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:* versions from (including) 3.6.0 up to (excluding) 3.6.9 | |
| Added | Reference Type | GitHub, Inc.: https://github.com/etcd-io/etcd/security/advisories/GHSA-rfx7-8w68-q57q Types: Mitigation, Vendor Advisory |
New CVE Received from GitHub, Inc. 3/26/2026 10:16:13 AM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | Description | 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. | |
| Added | CVSS V3.1 | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N | |
| Added | CWE | CWE-863 | |
| Added | Reference | https://github.com/etcd-io/etcd/security/advisories/GHSA-rfx7-8w68-q57q |
Quick Info
CVE Dictionary Entry:
CVE-2026-33343
NVD Published Date:
03/26/2026
NVD Last Modified:
03/26/2026
Source:
GitHub, Inc.