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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| symfony | symfony | < 5.4.52, >= 6.0.0-BETA1, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12 | — |
| symfony | yaml | < 5.4.52, >= 6.0.0-BETA1, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | symfony | 7.4.12+dfsg-1 | — |
| Debian 13 | symfony | 6.4.41+dfsg-0+deb13u1 | — |
| Debian 12 | symfony | 5.4.53+dfsg-0+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | symfony | No fix yet | — |
| Ubuntu 26.04 LTS | symfony | No fix yet | — |
| Ubuntu 25.10 | symfony | No fix yet | — |
| Ubuntu 16.04 LTS | symfony | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | symfony | No fix yet | — |
| Ubuntu Pro 22.04 LTS | symfony | No fix yet | — |
| Ubuntu Pro 20.04 LTS | symfony | No fix yet | — |
| Ubuntu Pro 18.04 LTS | symfony | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | symfony/symfony | < 5.4.52 | 5.4.52 | GHSA-4qpc-3hr4-r2p4 |
| Packagist | symfony/symfony | >= 6.0.0, < 6.4.40 | 6.4.40 | GHSA-4qpc-3hr4-r2p4 |
| Packagist | symfony/symfony | >= 7.0.0, < 7.4.12 | 7.4.12 | GHSA-4qpc-3hr4-r2p4 |
| Packagist | symfony/symfony | >= 8.0.0, < 8.0.12 | 8.0.12 | GHSA-4qpc-3hr4-r2p4 |
| Packagist | symfony/yaml | < 5.4.52 | 5.4.52 | GHSA-4qpc-3hr4-r2p4 |
| Packagist | symfony/yaml | >= 6.0.0, < 6.4.40 | 6.4.40 | GHSA-4qpc-3hr4-r2p4 |
| Packagist | symfony/yaml | >= 7.0.0, < 7.4.12 | 7.4.12 | GHSA-4qpc-3hr4-r2p4 |
| Packagist | symfony/yaml | >= 8.0.0, < 8.0.12 | 8.0.12 | GHSA-4qpc-3hr4-r2p4 |
Advisories 1
- WID-SEC-2026-1805 Zabbix: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 14, 2026
References
- https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4
- https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a970a
- https://github.com/symfony/symfony/releases/tag/v5.4.52
- https://github.com/symfony/symfony/releases/tag/v6.4.40
- https://github.com/symfony/symfony/releases/tag/v7.4.12
- https://github.com/symfony/symfony/releases/tag/v8.0.12