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

Quick assessment

Affected
etcd-io etcd
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

etcd-io etcd是etcd-io的分布式键值存储系统。 etcd-io etcd 3.5.32之前版本和3.6.13之前版本存在加密问题漏洞，该漏洞源于当etcd配置--listen-client-http-urls将HTTP和gRPC客户端端点拆分到不同监听器时，--client-crl-file证书吊销列表在gRPC监听器上未强制执行，允许持有吊销证书的客户端通过gRPC成功进行身份验证。

CVSS 6.5 · Medium EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 2

VendorProduct Version RangeStatus
etcd-io etcd >= 3.6.0-alpha.0, < 3.6.13 affected
< 3.5.32 affected
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I. Basic Information for CVE-2026-59818

Vulnerability Information
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Vulnerability Title
etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
etcd-io etcd 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
etcd-io etcd是etcd-io的分布式键值存储系统。 etcd-io etcd 3.5.32之前版本和3.6.13之前版本存在加密问题漏洞，该漏洞源于当etcd配置--listen-client-http-urls将HTTP和gRPC客户端端点拆分到不同监听器时，--client-crl-file证书吊销列表在gRPC监听器上未强制执行，允许持有吊销证书的客户端通过gRPC成功进行身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
etcd-io etcd >= 3.6.0-alpha.0, < 3.6.13 -

II. Public POCs for CVE-2026-59818

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III. Intelligence Information for CVE-2026-59818

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Patches & Fixes for CVE-2026-59818 (6)

Vendor Advisories for CVE-2026-59818 (1)

Vendor Pages for CVE-2026-59818 (1)

Other References for CVE-2026-59818 (1)

IV. Related Vulnerabilities

Same product: etcd
Same vendor: etcd-io
Same weakness: CWE-295

V. Comments for CVE-2026-59818

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