Hulumi: Policy packs bypassed by a forged Pulumi-URN logical name

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Hulumi is an open-source toolkit that ships secure-by-default cloud and platform infrastructure components for Pulumi. Prior to version 1.4.0, policy packs can be bypassed by a forged Pulumi-URN logical name. This issue has been patched in version 1.4.0.

Source published

24 Jul 2026 18:39:18 UTC

Source modified

24 Jul 2026 19:16:19 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 8.4 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N

Hulumi is an open-source toolkit that ships secure-by-default cloud and platform infrastructure components for Pulumi. Prior to version 1.4.0, policy packs can be bypassed by a forged Pulumi-URN logical name. This issue has been patched in version 1.4.0.

Source published

24 Jul 2026 19:16:58 UTC

Source modified

24 Oct 2026 13:10:00 UTC

Observed here

25 Oct 2026 12:17:26 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · [email protected] · Secondary · 8.4 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

**Affected:** `@hulumi/policies` `< 1.4.0` — **Fixed in:** `1.4.0` — **Severity:** High — **CWE-693 (Protection Mechanism Failure)** #### Summary Pulumi gives every cloud resource a structured URN that includes the resource's type chain (`hulumi:baseline:aws:SecureBucket$aws:s3/bucketV2:BucketV2`) and the _logical name_ the developer freely chose (anything after the final `::`). Several Hulumi policy rules used the URN to grant exemptions — for example, "if this raw bucket is a child of `SecureBucket`, skip the raw-bucket rule because the parent component handles hardening." The bug: the rules looked for a substring like `hulumi:baseline:aws:SecureBucket$` _anywhere_ in the URN. That substring can also appear in the developer-controlled logical-name portion. A developer (or compromised PR) could simply name a raw resource so its logical name carried the trusted substring, and every rule that used this check would treat the resource as if it were inside the trusted parent and skip its hardening check. Codex reported this for `DEPLOY_GOV_1`; the same anti-pattern existed in five more packs (unreported but identically exploitable): AWS H4/H5 sibling lookups, GitHub H1, GitHub H2, Cloudflare `CF_DNS_1`, Cloudflare `CF_DNSSEC_1`, and (advisory-level) CIS v5 §2.1.1 + §2.1.5. #### Impact Consumers using `@hulumi/policies` could ship raw `aws:s3:Bucket`, `github:Repository`, `cloudflare:Zone`, `cloudflare:DnsRecord`, and similar resources that bypassed mandatory hardening checks by naming themselves with a trusted substring. Every affected rule appeared to pass while the resource had none of the expected defaults. #### Patches Upgrade to `@hulumi/[email protected]`. A new shared helper at `packages/policies/src/urn.ts` parses Pulumi URNs structurally and only looks for the trusted parent-type token inside the URN's type-chain segment — never inside the developer-controlled logical name. All six prior call sites have been migrated to it. #### Workarounds None reliable — a local lint that rejects logical names containing `$` would catch the trivial form of the spoof but not crafted variants. #### Resources - [PR #178](https://github.com/kerberosmansour/hulumi/pull/178) (Cluster B); the URN-anchoring refactor and per-pack spoof-vector regression tests in `packages/policies/tests/`.

Source published

10 Jun 2026 13:37:38 UTC

Source modified

10 Sep 2026 03:50:50 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N

Publisher rating · HIGH