# CVE-2026-55878: Symfony: Path Traversal in symfony/ux-toolkit Allows Arbitrary File Write and Read via Crafted Recipe Manifest

> Attackers can write arbitrary files or read local files via crafted recipe manifests in Symfony UX toolkit, potentially leading to code execution.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 8 Jul 2026
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-p9xj-fpr2-jf2q

## What is CVE-2026-55878?

CVE-2026-55878 is a high-severity path traversal vulnerability in symfony ux, published on 8 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Symfony UX is a JavaScript ecosystem for Symfony. From 2.32.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux:install console command installs files from a recipe kit by copying paths listed in a copy-files map, and because Path::isRelative() accepts paths like ../../../etc, a crafted or compromised kit can write attacker-controlled content to arbitrary locations or read local files outside the recipe directory. This issue is fixed in versions 2.36.1 and 3.2.0.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-55878?

4 open source packages ship an affected version, including symfony/ux-toolkit.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `symfony/ux-toolkit` | Packagist | From 2.32.0 | 2.36.1 |
| `symfony/ux-toolkit` | Packagist | From 2.32.0 | 2.36.1 |
| `symfony/ux-toolkit` | Packagist | From 3.0.0 | 3.2.0 |
| `symfony/ux-toolkit` | Packagist | From 3.0.0 | 3.2.0 |

## How do I fix CVE-2026-55878?

Upgrade symfony/ux-toolkit to a fixed version for your release line: 2.36.1 or 3.2.0.

## Is CVE-2026-55878 being exploited?

There is no known exploitation of CVE-2026-55878 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-55878 and fix it if it is affected.

What it is: CVE-2026-55878 is a high-severity path traversal vulnerability in symfony ux, published on 8 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-55878 in the wild and no public exploit code.

Affected packages and fixed versions:
- symfony/ux-toolkit (Packagist): affected from 2.32.0; fixed in 2.36.1
- symfony/ux-toolkit (Packagist): affected from 2.32.0; fixed in 2.36.1
- symfony/ux-toolkit (Packagist): affected from 3.0.0; fixed in 3.2.0
- symfony/ux-toolkit (Packagist): affected from 3.0.0; fixed in 3.2.0

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-2026-55878/ (Markdown: https://insights.sbomify.com/CVE-2026-55878/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-55878
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-55878
- OSV: https://osv.dev/vulnerability/CVE-2026-55878

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-55878/
Summaries are generated and may contain mistakes; the official description above is the record.