Vulnerability Description
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\Component\Yaml\Parser resolved YAML collection aliases recursively, allowing a small untrusted YAML input to expand into a multi-gigabyte structure and exhaust memory. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sensiolabs | Symfony | < 5.4.52 |
Related Weaknesses (CWE)
References
- https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a97Patch
- https://github.com/symfony/symfony/releases/tag/v5.4.52ProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v6.4.40ProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v7.4.12ProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v8.0.12ProductRelease Notes
- https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4PatchVendor Advisory
FAQ
What is CVE-2026-45304?
CVE-2026-45304 is a vulnerability with a CVSS score of 7.5 (HIGH). Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\Component\Yaml\Parser resolved YAML collection al...
How severe is CVE-2026-45304?
CVE-2026-45304 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45304?
Check the references section above for vendor advisories and patch information. Affected products include: Sensiolabs Symfony.