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High, CVSS 7.0

Buildkite Elastic CI for AWS time-of-check-time-of-use race condition vulnerability

CVE-2023-43741GHSA-r5hg-349q-mg2q

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/buildkite/elastic-ci-stack-for-aws/v6 6.7.1), 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
7.0 · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
  • CVE-2023-43741: 0.19% estimated exploitation activity in the next 30 days; percentile 9.24 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

A time-of-check-time-of-use race condition vulnerability in Buildkite Elastic CI for AWS versions prior to 6.7.1 and 5.22.5 allows the buildkite-agent user to bypass a symbolic link check for the PIPELINEPATH variable in the fix-buildkite-agent-builds-permissions script.

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

    Published from ghsa record GHSA-r5hg-349q-mg2q

Agent brief

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# Patch Next advisory brief: CVE-2023-43741

Advisory: Buildkite Elastic CI for AWS time-of-check-time-of-use race condition vulnerability
IDs: CVE-2023-43741, GHSA-r5hg-349q-mg2q
Record: https://patchnext.com/advisories/cve-2023-43741 (revision 1, source checked 26 Oct 2026, 15:03 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/buildkite/elastic-ci-stack-for-aws/v6 6.7.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/buildkite/elastic-ci-stack-for-aws/v6: affected < 6.7.1; fixed in 6.7.1

## Suggested inspection (read-only)
- Go github.com/buildkite/elastic-ci-stack-for-aws/v6: 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 github.com/buildkite/elastic-ci-stack-for-aws/v6.
- 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-r5hg-349q-mg2q (GitHub-reviewed advisory GHSA-r5hg-349q-mg2q lists affected ranges: Go github.com/buildkite/elastic-ci-stack-for-aws/v6 >=0 <6.7.1)

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