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

Unknown severity · Source severity not reportedCVE-2026-54166

Shelf Vulnerable to Server-Side Request Forgery (SSRF) via Asset CSV Import imageUrl Validation Bypass

Answer in brief

CVE-2026-54166 records a Unknown severity vulnerability in Shelf Vulnerable to Server-Side Request Forgery (SSRF) via Asset CSV Import imageUrl Validation Bypass. The current sources do not mark it as known exploited. The current feed maps Shelf-nu/shelf.nu (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Shelf-nu/shelf.nu (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Shelf-nu/shelf.nugeneric	< 1.20.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Shelf-nu/shelf.nu.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.