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etcd vulnerable to TOCTOU of gateway endpoint authentication

GHSA-h8g9-6gvh-5mrc

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (go.etcd.io/etcd/v3 3.4.10, 3.3.23), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Vulnerability type Authentication Workarounds Refer to the gateway documentation. The vulnerability was spotted due to unclear documentation of how the gateway handles endpoints validation. Detail The gateway only authenticates endpoints detected from DNS SRV records, and it only authenticates the detected endpoints once. Therefore, if an endpoint changes its authentication settings, the gateway will continue to assume the endpoint is still authenticated. The auditors has noted that appropriate documentation of this validation functionality plus deprecation of this misleading functionality is an acceptable path forward. References Find out more on this vulnerability in the security audit report For more information If you have any questions or comments about this advisory: Contact the etcd security committee

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-h8g9-6gvh-5mrc

Agent brief

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# Patch Next advisory brief: GHSA-h8g9-6gvh-5mrc

Advisory: etcd vulnerable to TOCTOU of gateway endpoint authentication
IDs: GHSA-h8g9-6gvh-5mrc
Record: https://patchnext.com/advisories/ghsa-h8g9-6gvh-5mrc (revision 1, source checked 26 Oct 2026, 14:54 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: go.etcd.io/etcd/v3 3.4.10, 3.3.23. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go go.etcd.io/etcd/v3: affected >= 3.4.0, < 3.4.10; < 3.3.23; fixed in 3.3.23, 3.4.10

## Suggested inspection (read-only)
- Go go.etcd.io/etcd/v3: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on go.etcd.io/etcd/v3.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-h8g9-6gvh-5mrc (GitHub-reviewed advisory GHSA-h8g9-6gvh-5mrc lists affected ranges: Go go.etcd.io/etcd/v3 >=3.4.0 =0 <3.3.23)

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