CVE-2026-55878 json
Symfony: Path Traversal in symfony/ux-toolkit Allows Arbitrary File Write and Read via Crafted Recipe Manifest
published 4mo ago modified 17d ago also EUVD-2026-42443 , GHSA-p9xj-fpr2-jf2q
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 8%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist symfony/ux-toolkit 2.36.1, 3.2.0
- symfony ux 2.36.1, 3.2.0
Is CVE-2026-55878 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 4mo ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | symfony/ux-toolkit | >=2.32.0, <2.36.1 >=3.0.0, <3.2.0 |
2.36.1 3.2.0 |
Affected products
- symfony ux
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
- github.com /symfony/ux/commit/7b4ddf3764bf269a1b5fde5bf03c4bce568694e4
-
github.com
/symfony/ux/security/advisories/GHSA-p9xj-fpr2-jf2q
web
- github.com /symfony/ux/releases/tag/v2.36.1
- github.com /symfony/ux/releases/tag/v3.2.0
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/ux-toolkit/CVE-2026-55878.yaml
web
-
github.com
/symfony/ux
package
Sources
- CVE List CVE-2026-55878
- GitHub Advisory GHSA-p9xj-fpr2-jf2q
- NVD CVE-2026-55878
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.