What’s Vulnerable › Vulnerabilities

CVE-2026-59818: etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-08 · updated 2026-10-25
• Weakness: CWE-295

Description

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.

Affected products

• etcd-io etcd: before 3.5.32; from 3.6.0 before 3.6.13 — fixed in 3.5.32, 3.6.13

How to fix

Upgrade to a fixed version: etcd-io etcd 3.5.32, 3.6.13. Check the vendor advisory for mitigations.

References

• https://github.com/etcd-io/etcd/commit/2308ce1578064641d4d67c40f0487309267d1bef
• https://github.com/etcd-io/etcd/commit/24838af5a53dd0245adced920e42a9bf0e7a267f
• https://github.com/etcd-io/etcd/commit/8221ae82bc25d4d55ca64382207b69be71038cbb
• https://github.com/etcd-io/etcd/pull/22007
• https://github.com/etcd-io/etcd/pull/22021
• https://github.com/etcd-io/etcd/pull/22025
• https://github.com/etcd-io/etcd/releases/tag/v3.5.32
• https://github.com/etcd-io/etcd/releases/tag/v3.6.13
• https://github.com/etcd-io/etcd/security/advisories/GHSA-3wh4-j44w-pg92

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