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

Source: https://junglewise.ai/threats/cve-2026-33343-etcd-nested-etcd-transactions-bypass-rbac-authorization-checks  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-07  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/go-etcd-io-etcd), [go.etcd.io/etcd/v3 (Go)](https://junglewise.ai/threats/technologies/go-etcd-io-etcd-v3). Vendors: [Go](https://junglewise.ai/threats/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

  ```sh
  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

## Related threats

- [etcd TLS listener denial of service via connection exhaustion](https://junglewise.ai/threats/cve-2026-73500-etcd-tls-listener-denial-of-service-via-connection-exhaustion)
- [etcd authorization bypass in Watch gRPC API](https://junglewise.ai/threats/cve-2026-73499-etcd-authorization-bypass-in-watch-grpc-api)
- [etcd RBAC authorization bypass in transaction operations](https://junglewise.ai/threats/cve-2026-44283-etcd-rbac-authorization-bypass-in-transaction-operations)
- [GO-2026-4806 - Authorization bypasses in multiple APIs in go.etcd.io/etcd](https://junglewise.ai/threats/cve-2026-33413-etcd-authorization-bypasses-in-multiple-apis)
- [GO-2024-2528 - Etcd Gateway TLS endpoint validation only confirms TCP reachability in go.etcd.io/etcd](https://junglewise.ai/threats/go-2024-2528-etcd-gateway-tls-endpoint-validation-only-confirms-tcp-0788e9d2)