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Medium, CVSS 6.3amended

@hulumi/baseline: AccountFoundation reuse paths silently downgrade GuardDuty / Security Hub posture

CVE-2026-48037GHSA-cj8g-prcm-mfg5

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@hulumi/baseline 1.4.0), 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 4.0
6.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N · score source
EPSS
  • CVE-2026-48037: 0.45% estimated exploitation activity in the next 30 days; percentile 39.23 (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.

Affected: @hulumi/baseline < 1.4.0 — Fixed in: 1.4.0 — Severity: Medium — CWE-693 (Protection Mechanism Failure) Summary AccountFoundation can either create AWS detective services (GuardDuty for threat detection, Security Hub for compliance dashboards) or reuse pre-existing ones via opt-in flags. The reuse paths just imported the existing resources and reported success — they never checked whether the existing services were actually doing their job. 1. GuardDuty reuse. If the existing detector was suspended, or set to the slower 6-hour publishing cadence instead of the baseline 15-minute one, or otherwise misconfigured — Hulumi never noticed. The deployment succeeded with a misleadingly-positive guardDutyDetectorId output as if the baseline were active. 2. Security Hub reuse. Although the account import was read-only, Hulumi unconditionally created the CIS / NIST StandardsSubscription resources with default delete behaviour. Pulumi then treated those subscriptions as its own — a…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-cj8g-prcm-mfg5

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-cj8g-prcm-mfg5

Agent brief

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# Patch Next advisory brief: CVE-2026-48037

Advisory: @hulumi/baseline: AccountFoundation reuse paths silently downgrade GuardDuty / Security Hub posture
IDs: CVE-2026-48037, GHSA-cj8g-prcm-mfg5
Record: https://patchnext.com/advisories/cve-2026-48037 (revision 3, source checked 26 Oct 2026, 12:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @hulumi/baseline 1.4.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @hulumi/baseline: affected < 1.4.0; fixed in 1.4.0

## Suggested inspection (read-only)
- `npm ls @hulumi/baseline --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## 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 @hulumi/baseline.
- 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://osv.dev/vulnerability/GHSA-cj8g-prcm-mfg5 (OSV record GHSA-cj8g-prcm-mfg5 lists affected ranges: npm @hulumi/baseline >=0 <1.4.0 (fixed))
- Verified: https://github.com/advisories/GHSA-cj8g-prcm-mfg5 (GitHub-reviewed advisory GHSA-cj8g-prcm-mfg5 lists affected ranges: npm @hulumi/baseline >=0 <1.4.0)

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