Description
etcd versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11 are vulnerable to an improper authentication issue when role-based access control (RBAC) is used and client-cert-auth is enabled. If an etcd client server TLS certificate contains a Common Name (CN) which matches a valid RBAC username, a remote attacker may authenticate as that user with any valid (trusted) client certificate in a REST API request to the gRPC-gateway.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The etcd Project | etcd: | versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | etcd | 3.2.26+dfsg-1 | — |
| Debian 13 | etcd | 3.2.26+dfsg-1 | — |
| Debian 12 | etcd | 3.2.26+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | etcd | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Extras Other 7 | etcd | 3.2.26-1.el7 | RHSA-2019:1352 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | etcd | 3.4.16-3.1 | openSUSE-SU-2024:10741-1 |
| openSUSE Leap 15.6 | etcd | 3.5.12-150000.7.6.1 | SUSE-SU-2024:3656-1 |
| openSUSE Leap 15.5 | etcd | 3.5.12-150000.7.6.1 | SUSE-SU-2024:3656-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | go.etcd.io/etcd | < 0.5.0-alpha.5.0.20190108173120-83c051b701d3 | 0.5.0-alpha.5.0.20190108173120-83c051b701d3 | GHSA-h6xx-pmxh-3wgp |
| Go | go.etcd.io/etcd/v3 | >= 3.2.0, < 3.2.26 | 3.2.26 | GHSA-h6xx-pmxh-3wgp |
| Go | go.etcd.io/etcd/v3 | >= 3.3.0, < 3.3.11 | 3.3.11 | GHSA-h6xx-pmxh-3wgp |
Advisories 4
- WID-SEC-2022-0510 IBM DB2: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 18, 2026
- RHSA-2019:1352 Red Hat Security Advisory: etcd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Feb 21, 2026
- openSUSE-SU-2024:10741-1 etcd-3.4.16-3.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3656-1 Security update for etcd SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication
- 106540 vdb-entry
- https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication
- RHSA-2019:0237 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886
- FEDORA-2019-833466697f vendor-advisory
- FEDORA-2019-219b0b0b6a vendor-advisory
- RHSA-2019:1352 vendor-advisory