# CVE-2026-19504: Fabric.js loadFromJSON Server-Side Request Forgery Vulnerability

> Remote attackers can exploit improper URI validation in Fabric.js loadFromJSON to access internal network resources and disclose sensitive information.

- **Severity:** Medium 4.0 (`CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** GHSA-vc96-76vg-f8vj

## What is CVE-2026-19504?

CVE-2026-19504 is a medium-severity server-side request forgery vulnerability in Fabric.js, published on 15 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Fabric.js loadFromJSON Server-Side Request Forgery Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of Fabric.js. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the implementation of the loadFromJSON method. The issue results from the lack of proper validation of a URI prior to accessing resources. An attacker may be able to leverage this vulnerability to gain improper access to network resources. Was ZDI-CAN-29318.

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

## Which versions are affected by CVE-2026-19504?


## How do I fix CVE-2026-19504?

No fix has been published for CVE-2026-19504 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-19504 being exploited?

There is no known exploitation of CVE-2026-19504 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-19504 and fix it if it is affected.

What it is: CVE-2026-19504 is a medium-severity server-side request forgery vulnerability in Fabric.js, published on 15 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-2026-19504 in the wild and no public exploit code.

Affected product: Fabric.js. 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-2026-19504/ (Markdown: https://insights.sbomify.com/CVE-2026-19504/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-19504
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19504
- OSV: https://osv.dev/vulnerability/CVE-2026-19504

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-19504/
Summaries are generated and may contain mistakes; the official description above is the record.