CVE-2026-33343: GO-2026-4808 - Nested etcd transactions bypass RBAC authorization checks in go.etcd.io/etcd

CVE-2026-33343 · Severity: low · CVSS 3.1 · Published 2026-04-07

Nested etcd transactions bypass RBAC authorization checks in go.etcd.io/etcd

Technologies: go.etcd.io/etcd (Go), go.etcd.io/etcd/v3 (Go). Vendors: Go.

Quick answers

Is CVE-2026-33343 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33343 being exploited in the wild.
How severe is CVE-2026-33343?
Low severity, with a CVSS score of 3.1, published 7 April 2026.
Which products and versions are affected?
go.etcd.io/etcd (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=3.3.27; go.etcd.io/etcd/v3 (Go) SEMVER:introduced=0,fixed=3.4.42,introduced=3.5.0-alpha.0,fixed=3.5.28,introduced=3.6.0-alpha.0,fixed=3.6.9, SEMVER:introduced=3.6.0-alpha.0,fixed=3.6.9.
Is there a fix for CVE-2026-33343?
Yes. go.etcd.io/etcd/v3 (Go): upgrade to 3.6.9 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-33343?
Check whether you run go.etcd.io/etcd (Go) or go.etcd.io/etcd/v3 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • go.etcd.io/etcd/v3 (Go): upgrade to 3.6.9 or later
    go get go.etcd.io/etcd/v3@v3.6.9

Affected products

  • go.etcd.io/etcd (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=3.3.27
  • go.etcd.io/etcd/v3 (Go) SEMVER:introduced=0,fixed=3.4.42,introduced=3.5.0-alpha.0,fixed=3.5.28,introduced=3.6.0-alpha.0,fixed=3.6.9, SEMVER:introduced=3.6.0-alpha.0,fixed=3.6.9

Identifiers

  • CVE-2026-33343
  • GHSA-rfx7-8w68-q57q
  • GO-2026-4808

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