CVE-2026-33413 is a high-severity vulnerability (CVSS 8.8) impacting etcd versions prior to 3.4.42, 3.5.28, and 3.6.9. This flaw allows unauthorized users to bypass authentication or authorization checks in etcd clusters that expose the gRPC API to untrusted clients. Successful exploitation can lead to high impact on confidentiality, integrity, and availability, enabling attackers to disclose cluster topology, cause operational disruption, or trigger permanent data removal. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered some community discussion. Kubernetes deployments are generally not affected as they handle authentication and authorization separately.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.4.42CPE matchmatch criteria | cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:* | ||
>= 3.5.0, < 3.5.28CPE matchmatch criteria | cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:* | ||
>= 3.6.0, < 3.6.9CPE matchmatch criteria | cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.