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Fencer Vulns
none 0.0

CVE-2026-44283 json

etcd: Read access via PrevKv in etcd transactions may bypass RBAC authorization checks

published 2026-05-07 6 mo ago modified 2026-09-10 1 mo ago also BIT-etcd-2026-44283 , EUVD-2026-30345 , GHSA-x35m-3gp4-4fh5 , GO-2026-5736

cvss
0.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

etcd is a distributed key-value store for the data of a distributed system. Prior to 3.4.44, 3.5.30, and 3.6.11, a vulnerability in etcd allows read access via PrevKv, or lease attachment in Put requests within transaction operations, to bypass RBAC authorization checks. An authenticated user without sufficient read or lease-related permissions may be able to access unauthorized data or attach leases by invoking transaction operations with these features enabled. This vulnerability is fixed in 3.4.44, 3.5.30, and 3.6.11.

Patch / fix

  • go go.etcd.io/etcd/v3 3.5.30, 3.6.11
  • go go.etcd.io/etcd 3.4.44
  • bitnami etcd 3.4.44, 3.5.30, 3.6.11
  • go go.etcd.io/etcd/server/v3 3.5.30, 3.6.11
  • etcd etcd 3.4.44, 3.5.30, 3.6.11
  • redhat etcd 3.4.44, 3.5.30, 3.6.11
  • etcd Debian 14 3.5.16-11

debian advisories DEBIAN-CVE-2026-44283

  • etcd hummingbird 1 3.7.1-0.1.hum1

red hat advisories RHSA-2026:44868

  • govulncheck-vulndb SLES 16.0, SLES for SAP applications 16.0 0.0.20260727T201416-160000.1.1

suse advisories SUSE-SU-2026:23216-1SUSE-SU-2026:23227-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260727T201416-160000.1.1
  • flannel openSUSE Tumbleweed 0.28.5-1.1

opensuse advisories openSUSE-SU-2026:21551-1openSUSE-SU-2026:10980-1

  • etcd Azure Linux 3.0 3.5.30-2

azure linux advisories AZL-86898

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-2026-44283 updated cvss 4.3

etcd: etcd: Authenticated user can bypass RBAC for unauthorized data access

  • Red Hat OpenShift Container Platform 4 openshift4/ose-etcd-rhel9
    affected: workaround, no fix available
  • Red Hat OpenStack Platform 16.2 etcd, rhosp-rhel8/openstack-etcd Red Hat OpenStack Platform 17.1 etcd, rhosp-rhel9/openstack-etcd
    affected: workaround, no fix available, no fix planned “Will not fix”
  • 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
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 0.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
GitHub 3.1 0.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
OSV 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
go go.etcd.io/etcd/v3
>=3.6.0, <3.6.11
>=3.5.0, <3.5.30
3.6.11
3.5.30
go go.etcd.io/etcd
<3.4.44
3.4.44
bitnami etcd
<3.4.44
>=3.5.0, <3.5.30
>=3.6.0, <3.6.11
3.4.44
3.5.30
3.6.11
go go.etcd.io/etcd/server/v3
>=3.5.0, <3.5.30
>=3.6.0, <3.6.11
3.5.30
3.6.11

Affected products

  • etcd-io etcd

Classification

Weakness

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.