> CVE-2026-45304 [HIGH]

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PUBLISHED
2026-07-14 19:17
MODIFIED
2026-07-14 19:17
CVSS_SCORE V3
8.7
EPSS (Prob. Exploit)
0.68%
Top 47.9%
DATA SOURCES:
NVD 🔗 2026-07-14 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-10-29 OSV 🔗 2026-07-18

> 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

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

> MÉTRIQUES CVSS DÉTAILLÉES

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-776

> CWE DETAILED DESCRIPTIONS

CWE-776: Improper Restriction of Recursive Entity References in DTDs - The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.

> GITHUB SECURITY ADVISORY

GHSA-4qpc-3hr4-r2p4 LOW

Symfony's YAML Parser Vulnerable to Exponential Memory Allocation via Recursive Collection-Alias Expansion ("Billion Laughs")

AFFECTED PACKAGES:
COMPOSER / symfony/yaml
>= 8.0.0, < 8.0.12
Fixed in: 8.0.12
COMPOSER / symfony/yaml
>= 7.0.0, < 7.4.12
Fixed in: 7.4.12
COMPOSER / symfony/yaml
>= 6.0.0, < 6.4.40
Fixed in: 6.4.40
COMPOSER / symfony/symfony
>= 8.0.0, < 8.0.12
Fixed in: 8.0.12
COMPOSER / symfony/symfony
>= 7.0.0, < 7.4.12
Fixed in: 7.4.12
COMPOSER / symfony/symfony
>= 6.0.0, < 6.4.40
Fixed in: 6.4.40
COMPOSER / symfony/symfony
< 5.4.52
Fixed in: 5.4.52
COMPOSER / symfony/yaml
< 5.4.52
Fixed in: 5.4.52

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Symfony: YAML Parser Exponential Memory Allocation via Recursive Collection-Alias Expansion ("Billion Laughs")

AFFECTED PACKAGES:
Unknown / Unknown
245 versions affected
ALIASES:
GHSA-4qpc-3hr4-r2p4

> HISTORIQUE DES MODIFICATIONS

Première apparition
14/07/2026 19:17
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') - The product uses XML documents and allows their structure to be defined with a Document Type Definition ...
Nouvelle valeur:
CWE-776: Improper Restriction of Recursive Entity References in DTDs - The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not pr...
📊 ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') - The product uses XML documents and allows their structure to be defined with a Document Type Definition ...
Total des modifications: 2 Dernière mise à jour: 5 days ago

> REFERENCES

https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a97...
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
https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4
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