CVE-2026-33343 | etcd-io etcd up to 3.4.41/3.5.27/3.6.8 authorization

VDB-353620 · CVE-2026-33343 · GCVE-0-2026-33343 ETCD-IO ETCD UP TO 3.4.41/3.5.27/3.6.8 AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.0 $0-$5k 1.94+ Summaryinfo A vulnerability categorized as critical has been discovered in etcd-io etcd up to 3.4.41/3.5.27/3.6.8. This vulnerability affects unknown code. Executing a manipulation can lead to authorization. This vulnerability is registered as CVE-2026-33343. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component. Detailsinfo A vulnerability classified as critical was found in etcd-io etcd up to 3.4.41/3.5.27/3.6.8. This vulnerability affects an unknown functionality. 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, integrity, and availability. CVE summarizes: etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, and 3.6.9, an authenticated user with RBAC restricted permissions on key ranges can use nested transactions to bypass all key-level authorization. This allows any authenticated user with direct access to etcd to effectively ignore all key range restrictions, accessing the entire etcd data store. 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. Versions 3.4.42, 3.5.28, and 3.6.9 contain a patch. 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 and require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-33343 since 03/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. Upgrading to version 3.4.42, 3.5.28 or 3.6.9 eliminates this vulnerability. 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 3.5.0 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 3.6.0 3.6.1 3.6.2 3.6.3 3.6.4 3.6.5 3.6.6 3.6.7 3.6.8 Website Product: https://github.com/etcd-io/etcd/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.1 VulDB Meta Temp Score: 5.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 3.9 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authorization CWE: CWE-863 / CWE-285 / CWE-266 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: etcd 3.4.42/3.5.28/3.6.9 Timelineinfo 03/18/2026 CVE reserved 03/26/2026 +8 days Advisory disclosed 03/26/2026 +0 days VulDB entry created 03/26/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-33343 (🔒) GCVE (CVE): GCVE-0-2026-33343 GCVE (VulDB): GCVE-100-353620 Entryinfo Created: 03/26/2026 15:01 Changes: 03/26/2026 15:01 (62) Complete: 🔍 Cache ID: 99:F7D:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸