# CVE-2026-54166: Shelf Vulnerable to Server-Side Request Forgery (SSRF) via Asset CSV Import imageUrl Validation Bypass

> Authenticated users can bypass URL validation to trigger SSRF, accessing internal services or causing memory exhaustion via buffered responses.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** GHSA-xgrm-8w6v-mvjg

## What is CVE-2026-54166?

CVE-2026-54166 is a high-severity server-side request forgery vulnerability in Shelf-nu shelf.nu, published on 11 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Shelf is a platform for tracking physical assets. Prior to version 1.20.3, authenticated users with the `asset:import` permission can trigger server-side HTTP requests to attacker-controlled URLs through the Asset CSV Content Import feature. The `imageUrl` validation logic can be bypassed through multiple techniques, including image-extension suffixes, image-related path keywords, domain substring matching, and redirect chains. After validation, the server performs an unrestricted `fetch()` request to the supplied URL. This results in a Server-Side Request Forgery (SSRF) vulnerability that allows attackers to reach internal network services, cloud metadata endpoints, and arbitrary external hosts from the application's network context. Additionally, response bodies are fully buffered before size validation, creating a potential memory exhaustion vector. Version 1.20.3 patches the issue.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-54166?


## How do I fix CVE-2026-54166?

No fix has been published for CVE-2026-54166 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-54166 being exploited?

There is no known exploitation of CVE-2026-54166 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54166 and fix it if it is affected.

What it is: CVE-2026-54166 is a high-severity server-side request forgery vulnerability in Shelf-nu shelf.nu, published on 11 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-54166 in the wild and no public exploit code.

Affected product: Shelf-nu shelf.nu. 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-2026-54166/ (Markdown: https://insights.sbomify.com/CVE-2026-54166/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54166
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54166
- OSV: https://osv.dev/vulnerability/CVE-2026-54166

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54166/
Summaries are generated and may contain mistakes; the official description above is the record.