CVE-2026-33413 | etcd-io etcd up to 3.4.41/3.5.27/3.6.8 gRPC API authorization

VDB-353614 · CVE-2026-33413 · GCVE-0-2026-33413 ETCD-IO ETCD UP TO 3.4.41/3.5.27/3.6.8 GRPC API AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $0-$5k 1.76+ Summaryinfo A vulnerability, which was classified as critical, was found in etcd-io etcd up to 3.4.41/3.5.27/3.6.8. This affects an unknown function of the component gRPC API. Executing a manipulation can lead to authorization. The identification of this vulnerability is CVE-2026-33413. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component. Detailsinfo A vulnerability has been found in etcd-io etcd up to 3.4.41/3.5.27/3.6.8 and classified as critical. This vulnerability affects some unknown functionality of the component gRPC API. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. 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, unauthorized users may bypass authentication or authorization checks and call certain etcd functions in clusters that expose the gRPC API to untrusted or partially trusted clients. In unpatched etcd clusters with etcd auth enabled, unauthorized users are able to call MemberList and learn cluster topology, including member IDs and advertised endpoints; call Alarm, which can be abused for operational disruption or denial of service; use Lease APIs, interfering with TTL-based keys and lease ownership; and/or trigger compaction, permanently removing historical revisions and disrupting watch, audit, and recovery workflows. 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/or require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution. The advisory is available at github.com. This vulnerability was named CVE-2026-33413 since 03/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not 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: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 7.0 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 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-862 / CWE-863 / CWE-285 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 03/19/2026 CVE reserved 03/26/2026 +7 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-2026-33413 (🔒) GCVE (CVE): GCVE-0-2026-33413 GCVE (VulDB): GCVE-100-353614 Entryinfo Created: 03/26/2026 14:59 Changes: 03/26/2026 14:59 (66) Complete: 🔍 Cache ID: 99:F0C:101 Discussion No comments yet. 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