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Advisory severityMedium6.5Red Hat Linux

Medium [CVE-2026-59818] Authentication bypass due to improper Certificate Revocation List enforcement on gRPC listener

This medium-severity Red Hat Linux advisory covers CVE-2026-59818 affecting Red Hat Hardened Images, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-59818 Source published Source updated

VulniPulse record published Record updated

CVE-2026-59818
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

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. This oversight allows a client with a revoked certificate to successfully authenticate, potentially leading to unauthorized access and compromise of data integrity.

Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-295.

Affected Red Hat products: Red Hat Hardened Images; Red Hat OpenStack Platform 16.2; Red Hat OpenStack Platform 17.1. Red Hat fixing advisory: RHSA-2026:44868.

Is CVE-2026-59818 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-59818 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-59818?

Upgrade to a fixed release named by Red Hat:

  • 3.5.32
  • 3.6.13
  • etcd-main-3.7.1-0.1.hum1
  • RHSA-2026:44868

Confirm against the vendor advisory before you patch.

Affected versions
  • < 3.5.32
  • < 3.6.13

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Fixed versions
  • 3.5.32
  • 3.6.13
  • etcd-main-3.7.1-0.1.hum1
  • RHSA-2026:44868

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Mitigation

Upgrade to a fixed release: 3.5.32, 3.6.13, etcd-main-3.7.1-0.1.hum1, RHSA-2026:44868. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

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