etcd-io etcd up to 3.4.43/3.5.29/3.6.10 Attachments authorization

Summaryinfo

A vulnerability classified as problematic has been found in etcd-io etcd up to 3.4.43/3.5.29/3.6.10. This affects an unknown function of the component Attachments Handler. This manipulation causes authorization. This vulnerability appears as CVE-2026-44283. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in etcd-io etcd up to 3.4.43/3.5.29/3.6.10. Affected by this vulnerability is some unknown processing of the component Attachments Handler. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-44283 since 05/05/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 3.4.44 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-30345). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• etcd-io

Name

• etcd

Version

• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 3.4.4
• 3.4.5
• 3.4.6
• 3.4.7
• 3.4.8
• 3.4.9
• 3.4.10
• 3.4.11
• 3.4.12
• 3.4.13
• 3.4.14
• 3.4.15
• 3.4.16
• 3.4.17
• 3.4.18
• 3.4.19
• 3.4.20
• 3.4.21
• 3.4.22
• 3.4.23
• 3.4.24
• 3.4.25
• 3.4.26
• 3.4.27
• 3.4.28
• 3.4.29
• 3.4.30
• 3.4.31
• 3.4.32
• 3.4.33
• 3.4.34
• 3.4.35
• 3.4.36
• 3.4.37
• 3.4.38
• 3.4.39
• 3.4.40
• 3.4.41
• 3.4.42
• 3.4.43
• 3.5.0
• 3.5.1
• 3.5.2
• 3.5.3
• 3.5.4
• 3.5.5
• 3.5.6
• 3.5.7
• 3.5.8
• 3.5.9
• 3.5.10
• 3.5.11
• 3.5.12
• 3.5.13
• 3.5.14
• 3.5.15
• 3.5.16
• 3.5.17
• 3.5.18
• 3.5.19
• 3.5.20
• 3.5.21
• 3.5.22
• 3.5.23
• 3.5.24
• 3.5.25
• 3.5.26
• 3.5.27
• 3.5.28
• 3.5.29
• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3
• 3.6.4
• 3.6.5
• 3.6.6
• 3.6.7
• 3.6.8
• 3.6.9
• 3.6.10

Website

• Product: https://github.com/etcd-io/etcd/

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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