SB2026072472 - Improper Certificate Validation in etcd

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Main Vulnerability Database SB2026072472

SB2026072472 - Improper Certificate Validation in etcd

Published: July 24, 2026

Security Bulletin ID SB2026072472
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Certificate Validation (CVE-ID: CVE-2026-59818)

CWE-ID: CWE-295 - Improper Certificate Validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to bypass certificate revocation list enforcement and authenticate with a revoked certificate.

The vulnerability exists due to improper certificate validation in the gRPC client listener when `--listen-client-http-urls` is configured to split HTTP and gRPC client endpoints onto separate listeners. A remote privileged user can present a revoked certificate over gRPC to bypass certificate revocation list enforcement and authenticate with a revoked certificate.

The HTTP endpoint correctly rejects revoked certificates, but the gRPC listener continues to accept them in this configuration.


Remediation

Install update from vendor's website.

References