GHSA-x35m-3gp4-4fh5Published

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

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cve-program · CVE-2026-44283

Published

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.

Source published: 14 May 2026 17:01:33 UTC
Source modified: 16 May 2026 00:40:51 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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CVSS 3.1 · 0.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

euvd · EUVD-2026-30345

Published

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datePublished: May 14, 2026, 5:01:33 PM

dateUpdated: May 16, 2026, 12:40:51 AM

3 related source bulletins · separate from aliases

openSUSE-SU-2026:10980-1: flannel-0.28.5-1.1 on GA media

CVE-2026-44283

RHSA-2026:44868: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

CVE-2026-44283 · CVE-2026-59818 · CVE-2026-73500

msrc_CVE-2026-44283: etcd: Read access via PrevKv in etcd transactions may bypass RBAC authorization checks

CVE-2026-44283

Source published: May 14, 2026, 5:01:33 PM (timezone not stated)
Source modified: May 16, 2026, 12:40:51 AM (timezone not stated)
Saved here: 13 Nov 2026 12:59:50 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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nvd · CVE-2026-44283

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-863

Original publisher date fields

published: 2026-05-14T18:16:49.650

lastModified: 2026-11-11T20:10:00.273

1 source CPE criteria · context only

cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 14 May 2026 18:16:49 UTC
Source modified: 11 Nov 2026 20:10:00 UTC
Saved here: 12 Nov 2026 18:19:07 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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CVSS 3.1 · [email protected] · Secondary · 0.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

CVSS 3.1 · [email protected] · Primary · 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

osv · GHSA-x35m-3gp4-4fh5

Published

### Impact _What kind of vulnerability is it? Who is impacted?_ 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. Kubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected. ### Patches _Has the problem been patched? What versions should users upgrade to?_ This vulnerability is patched in the following versions: - etcd 3.6.11 - etcd 3.5.30 - etcd 3.4.44 ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ If upgrading is not immediately possible, reduce exposure by treating the affected RPCs as unauthenticated in practice. - restrict network access to etcd server ports so only trusted components can connect - require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution ### Reporters Samy Ghannad (@SamyGhannad on Github) reported that read access via PrevKv in a Put request within etcd transactions bypassed RBAC authorization checks. Benjamin Wang (@ahrtr ) further analyzed that lease attachment in a Put request within etcd transactions also bypassed RBAC authorization checks

Source published: 7 May 2026 03:21:53 UTC
Source modified: 10 Sep 2026 03:51:07 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

Publisher rating · LOW

osv · GO-2026-5736

Published

Etcd RBAC bypass via PrevKv/lease in nested transactions in go.etcd.io/etcd/v3 in go.etcd.io/etcd/server

Source published: 24 Jul 2026 18:35:55 UTC
Source modified: 25 Jul 2026 15:44:46 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

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