# CVE-2026-100693: Hugo v0.162.0 before v0.166.0 IP-literal Deny Rule Bypass

> Attackers can bypass IP restrictions in Hugo's remote resource fetching by using mixed-case URL schemes, allowing access to internal network services.

- **Severity:** High 8.6 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Sep 2026
- **Updated:** 30 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-100693, GHSA-pmrv-x7gp-2rjw, GHSA-xpjr-56xg-vx6v, MINI-2c9x-jmgv-chf4, MINI-rwj8-rm4f-f5g5, UBUNTU-CVE-2026-100693

## What is CVE-2026-100693?

CVE-2026-100693 is a high-severity server-side request forgery vulnerability in gohugoio hugo, published on 26 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Hugo versions from v0.162.0 before v0.166.0 contain a case-sensitive validation flaw in the security.http.urls IP-literal deny rule that allows attackers to bypass restrictions. Attackers can use mixed-case URL schemes in resources.GetRemote calls to fetch from restricted IP addresses like localhost.

Weakness: CWE-178 (Improper Handling of Case Sensitivity)

## Which versions are affected by CVE-2026-100693?

It affects 1 product.


Products: Gohugo Hugo.

## How do I fix CVE-2026-100693?

Upgrade to a fixed version.

## Is CVE-2026-100693 being exploited?

There is no known exploitation of CVE-2026-100693 in the wild and no public exploit code.

## Other vulnerabilities in gohugoio hugo

- [CVE-2026-75926](https://insights.sbomify.com/CVE-2026-75926/): Hugo 0.162.0 to 0.164.x - Node Permission Model Bypass via Default TailwindCSS Child-Process Grant (critical 9.3)
- [CVE-2026-100690](https://insights.sbomify.com/CVE-2026-100690/): Hugo v0.161.0 to v0.165.0 Arbitrary File Read via Symlinks (high 8.7)
- [CVE-2026-100692](https://insights.sbomify.com/CVE-2026-100692/): Hugo before v0.166.0 Path Traversal via Symlinked Mount Roots (high 8.7)
- [CVE-2020-26284](https://insights.sbomify.com/CVE-2020-26284/): Hugo can execute a binary from the current directory on Windows (high 7.7)
- [CVE-2026-50135](https://insights.sbomify.com/CVE-2026-50135/): Hugo: Symlink confinement bypass in resources.Get (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-100693 and fix it if it is affected.

What it is: CVE-2026-100693 is a high-severity server-side request forgery vulnerability in gohugoio hugo, published on 26 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-100693 in the wild and no public exploit code.

Affected product: gohugoio hugo. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-100693/ (Markdown: https://insights.sbomify.com/CVE-2026-100693/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100693
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100693
- OSV: https://osv.dev/vulnerability/CVE-2026-100693

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-100693/
Summaries are generated and may contain mistakes; the official description above is the record.