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CVE-2026-33413 is an authorization bypass vulnerability in etcd affecting releases prior to 3.4.42, 3.5.28, and 3.6.9. In etcd clusters with built-in authentication enabled, certain gRPC API methods do not receive proper authentication or authorization enforcement, allowing unauthorized or insufficiently privileged clients to invoke sensitive functions. Reported exposed operations include MemberList, Alarm, Lease-related APIs, and compaction functionality. The flaw arises from missing authorization checks on specific request paths, allowing backend processing of selected maintenance and cluster-management operations under the assumption that access control had already been enforced earlier in the request pipeline. As a result, untrusted clients connected to the etcd gRPC interface can access cluster topology information, interfere with lease and TTL-backed behavior, and invoke disruptive maintenance actions.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authorization bypass vulnerability in etcd that can allow information disclosure and denial of service.
An etcd authorization bypass vulnerability that can allow information disclosure and denial of service.
A critical authentication bypass vulnerability in etcd that allows unauthenticated or underprivileged users with network access to the client gRPC endpoint to invoke sensitive maintenance and backend methods without proper authorization.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.