High severity · published Jul 8, 2026
CVE-2026-55878
Symfony: Path Traversal in symfony/ux-toolkit Allows Arbitrary File Write and Read via Crafted Recipe Manifest
7.8
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UX
ux · symfony
>= 2.32.0, < 2.36.1; >= 3.0.0, < 3.2.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55878
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55878
github.com
https://github.com/symfony/ux/commit/7b4ddf3764bf269a1b5fde5bf03c4bce568694e4
github.com
https://github.com/symfony/ux/releases/tag/v2.36.1
github.com
https://github.com/symfony/ux/releases/tag/v3.2.0
github.com
https://github.com/symfony/ux/security/advisories/GHSA-p9xj-fpr2-jf2q
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