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CVE-2026-58404— Hugo security.http.urls deny rules bypassed by alternate IPv4 encodings

Quick assessment

Affected
gohugoio hugo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gohugo hugo是gohugo团队开源的一个生成静态网站的框架。 GoHugo Hugo v0.162.0版本至v0.163.0版本存在服务端请求伪造漏洞，该漏洞源于默认的security.http.urls策略对IPv4地址的编码方式检查不完善，导致整数、十六进制或八进制等替代编码方式绕过规则，当模板传递不可信或数据派生的URL给resources.GetRemote且主机平台使用cgo系统解析器时，可对回环地址和内部服务（包括托管或CI构建中的云元数据端点）发起构建时服务端请求。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.37% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
gohugoio hugo >= v0.162.0, < v0.163.1 affected
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I. Basic Information for CVE-2026-58404

Vulnerability Information
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Vulnerability Title
Hugo security.http.urls deny rules bypassed by alternate IPv4 encodings
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
GoHugo Hugo 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gohugo hugo是gohugo团队开源的一个生成静态网站的框架。 GoHugo Hugo v0.162.0版本至v0.163.0版本存在服务端请求伪造漏洞，该漏洞源于默认的security.http.urls策略对IPv4地址的编码方式检查不完善，导致整数、十六进制或八进制等替代编码方式绕过规则，当模板传递不可信或数据派生的URL给resources.GetRemote且主机平台使用cgo系统解析器时，可对回环地址和内部服务（包括托管或CI构建中的云元数据端点）发起构建时服务端请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gohugoio hugo >= v0.162.0, < v0.163.1 -

II. Public POCs for CVE-2026-58404

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III. Intelligence Information for CVE-2026-58404

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Patches & Fixes for CVE-2026-58404 (2)

Vendor Advisories for CVE-2026-58404 (1)

Vendor Pages for CVE-2026-58404 (1)

Same Patch Batch · gohugoio · 2026-07-06 · 6 CVEs total

CVE-2026-58402 Hugo default code block renderer XSS via unescaped code-fence language
CVE-2026-58403 Hugo symlink confinement bypass in os.ReadFile
CVE-2026-50134 Hugo: security.http.urls allow-list bypass via HTTP redirects
CVE-2026-50133 Hugo: XSS via text/html content files
CVE-2026-50135 Hugo: Symlink confinement bypass in resources.Get

IV. Related Vulnerabilities

Same product: hugo
Same vendor: gohugoio
Same weakness: CWE-918

V. Comments for CVE-2026-58404

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