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Fencer Vulns
medium 6.5

CVE-2026-59818 json

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

published 2026-07-08 4 mo ago modified 2026-10-25 14 d ago also BIT-etcd-2026-59818 , EUVD-2026-42426 , GHSA-3wh4-j44w-pg92

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

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.

Patch / fix

  • bitnami etcd 3.5.32, 3.6.13
  • etcd etcd 3.5.32, 3.6.13
  • redhat etcd 3.5.32, 3.6.13
  • etcd hummingbird 1 3.7.1-0.1.hum1

red hat advisories RHSA-2026:44868

  • etcd Azure Linux 3.0 3.5.33-1

azure linux advisories AZL-92141

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-59818 updated cvss 6.5

etcd: etcd: Authentication bypass due to improper Certificate Revocation List enforcement on gRPC listener

  • Red Hat OpenStack Platform 16.2 etcd Red Hat OpenStack Platform 17.1 etcd
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images etcd 3.7.1-0.1.hum1
    fixed: vendor fix RHSA-2026:44868

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
OSV 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
bitnami etcd
<3.5.32
>=3.6.0, <3.6.13
3.5.32
3.6.13

Affected products

  • etcd-io etcd

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.