Vulnerability · Published Jul 8, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity improper certificate validation in etcd from etcd-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 62.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	etcd	no fix listed	DEBIAN-CVE-2026-59818
Debian:14	etcd	no fix listed	DEBIAN-CVE-2026-59818
Ubuntu:25.10	etcd	no fix listed	UBUNTU-CVE-2026-59818
Ubuntu:26.10	etcd	no fix listed	UBUNTU-CVE-2026-59818

Affected products (as reported)

Vendor	Product	Versions
etcd-io	etcd	>= 3.6.0-alpha.0, < 3.6.13< 3.5.32

Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

References

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