---
cve: "CVE-2026-45304"
severity: "HIGH"
cvss: 8.7
epss: "80%"
vendor: "symfony"
kev: false
exploited: false
published: "2026-07-14 19:17:07"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-15T15:51:18+02:00"
---

# CVE-2026-45304

> 8.7 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 355f32f4318c962842f016eabd0966fde739f6fc (Commit)
- 816860d96c4fb7ffd7708ae0531ea6e5a1190773 (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-45304) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_