Vulnerability 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 Score
HIGH
Related Weaknesses (CWE)
References
- 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
- https://github.com/symfony/ux/security/advisories/GHSA-p9xj-fpr2-jf2q
FAQ
What is CVE-2026-55878?
CVE-2026-55878 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 co...
How severe is CVE-2026-55878?
CVE-2026-55878 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55878?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.