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-leve…
Historical advisory saved 28 Oct 2026 03:59:07 UTC. The publisher may have updated it since then. Latest advisory.
euvd · EUVD-2026-20077
Publishedetcd 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.
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datePublished: Mar 26, 2026, 1:23:48 PM
dateUpdated: Mar 26, 2026, 6:25:09 PM
1 related source bulletins · separate from aliases
msrc_CVE-2026-33343: etcd: Nested etcd transactions bypass RBAC authorization checks
CVE-2026-33343
- Source published
- Mar 26, 2026, 1:23:48 PM (timezone not stated)
- Source modified
- Mar 26, 2026, 6:25:09 PM (timezone not stated)
- Saved here
- 28 Oct 2026 03:59:07 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
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Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.