8.7

CVE-2026-45304

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Sensiolabs ≫ Symfony Version < 5.4.52
Sensiolabs ≫ Symfony Version >= 6.0.0 < 6.4.40
Sensiolabs ≫ Symfony Version >= 7.0.0 < 7.4.12
Sensiolabs ≫ Symfony Version >= 8.0.0 < 8.0.12
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.8% 0.526
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
security-advisories@github.com 8.7 0 0
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
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 (DTD), but it does not properly control the number of recursive definitions of entities.

https://github.com/symfony/symfony/releases/tag/v5.4.52
Product
Release Notes
https://github.com/symfony/symfony/releases/tag/v6.4.40
Product
Release Notes
https://github.com/symfony/symfony/releases/tag/v7.4.12
Product
Release Notes
https://github.com/symfony/symfony/releases/tag/v8.0.12
Product
Release Notes
https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a970a
Patch
https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4
Patch
Vendor Advisory