Vulnerability in Etcd
CVE-2026-59818
etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 and 3.6.13, when etcd is configured with --listen-client-http-urls to split HTTP and gRPC client endpoints onto separate listeners, the --client-crl-file Certificate Revocation List is not enforced on the gRPC listener, allowing a client with a revoked certificate to authenticate successfully over gRPC. This issue is fixed in versions 3.5.32 and 3.6.13.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Etcd
- Etcd-Io Etcd — versions >= 3.6.0-alpha.0, < 3.6.13, < 3.5.32
Weakness classification (CWE)
References
- github.com/etcd-io/etcd/commit/2308ce1578064641d4d67c40f0487309267d1bef (Patch)
- github.com/etcd-io/etcd/commit/24838af5a53dd0245adced920e42a9bf0e7a267f (Patch)
- github.com/etcd-io/etcd/commit/8221ae82bc25d4d55ca64382207b69be71038cbb (Patch)
- github.com/etcd-io/etcd/pull/22007 (Patch, Issue Tracking)
- github.com/etcd-io/etcd/pull/22021 (Patch, Issue Tracking)
- github.com/etcd-io/etcd/pull/22025 (Patch, Issue Tracking)
- github.com/etcd-io/etcd/releases/tag/v3.5.32 (Product, Release Notes)
- github.com/etcd-io/etcd/releases/tag/v3.6.13 (Product, Release Notes)
- github.com/etcd-io/etcd/security/advisories/GHSA-3wh4-j44w-pg92 (Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-59818?
- CVE-2026-59818 is a medium-severity vulnerability in Etcd, classified under Improper Certificate Validation. CVSS score: 6.5/10. Published 2026-07-08.
- How severe is CVE-2026-59818?
- Medium severity. CVSS v3 base score is 6.5 out of 10.