GHSA-r46f-3rpw-hxrvPublished

Hugo security.http.urls deny rules bypassed by alternate IPv4 encodings

Collected exploitation and prediction evidence

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.

cve-program · CVE-2026-58404

Published

Hugo is a static site generator. From v0.162.0 through v0.163.0, the default security.http.urls policy denies requests to loopback, internal, and cloud-metadata IPv4 literals, but the deny rule only matched dotted-decimal notation, so alternate IPv4 encodings of the same addresses, including integer, hex, or octal, passed the policy. When a template passes an untrusted or data-derived URL to resources.GetRemote and the host platform uses the cgo system resolver, these encodings resolve to the blocked address, allowing build-time server-side requests to loopback and internal services, including the cloud-metadata endpoint in hosted or CI builds; the same check is reused on redirects, so the gap also applies to each redirect hop. This issue is fixed in v0.163.1.

Source published: 6 Jul 2026 19:16:15 UTC
Source modified: 7 Jul 2026 15:08:53 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 4.6 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

euvd · EUVD-2026-41918

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jul 6, 2026, 7:16:15 PM

dateUpdated: Jul 7, 2026, 3:08:53 PM

1 related source bulletins · separate from aliases

RHSA-2026:36862: Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

CVE-2026-50133 · CVE-2026-58402 · CVE-2026-58403 · CVE-2026-58404

Source published: Jul 6, 2026, 7:16:15 PM (timezone not stated)
Source modified: Jul 7, 2026, 3:08:53 PM (timezone not stated)
Observed here: 7 Nov 2026 13:23:43 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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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: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 4.0 · 4.6 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

nvd · CVE-2026-58404

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-918

Original publisher date fields

published: 2026-07-06T20:16:38.307

lastModified: 2026-10-25T20:10:00.147

1 source CPE criteria · context only

cpe:2.3:a:gohugo:hugo:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 6 Jul 2026 20:16:38 UTC
Source modified: 25 Oct 2026 20:10:00 UTC
Observed here: 27 Oct 2026 15:15:28 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 · 4.6 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/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

CVSS 3.1 · [email protected] · Primary · 6.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

osv · GHSA-r46f-3rpw-hxrv

Published

### Impact The default `security.http.urls` policy denies requests to loopback, internal, and cloud-metadata IPv4 literals (e.g. `http://127.0.0.1/`, `http://169.254.169.254/`). The deny rule only matched dotted-decimal notation, so alternate IPv4 encodings of the same addresses — integer, hex, or octal, which contain no dot — passed the policy: - `http://2130706433/` → `127.0.0.1` - `http://2852039166/` → `169.254.169.254` (cloud metadata) - `http://0x7f000001/`, `http://017700000001/`, `http://0/` When a template passes an untrusted or data-derived URL to `resources.GetRemote` and the host platform uses the cgo system resolver, these encodings resolve to the blocked address — allowing build-time server-side requests to loopback and internal services, including the cloud-metadata endpoint in hosted/CI builds. The same check is reused on redirects, so the gap also applies to each redirect hop. This affects sites that rely on `security.http.urls` as a security boundary while fetching attacker-influenced remote URLs; it does not affect sites that fully trust the URLs they fetch. ### Patches Fixed in **v0.163.1**. Integer/hex/octal IPv4 hosts are now canonicalized to dotted-decimal before the policy is applied, so every encoding of an address is treated alike. No configuration change is required. ### Workarounds Avoid passing untrusted URLs to `resources.GetRemote`, or tighten `security.http.urls` to an explicit allow-list of trusted hosts. ### Affected versions v0.162.0 – v0.163.0 (patched in v0.163.1).

Source published: 19 Jun 2026 19:18:14 UTC
Source modified: 24 Jul 2026 19:11:46 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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: 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:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

Publisher rating · HIGH

osv · GO-2026-5606

Published

Hugo: security.http.urls deny rules bypassed by alternate IPv4 encodings (SSRF) in github.com/gohugoio/hugo

Source published: 24 Jul 2026 18:35:55 UTC
Source modified: 24 Jul 2026 19:11:46 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

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: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.