PHP Framework Vulnerability in Symfony Affecting Multiple Versions
CVE-2026-45305

8.7HIGH

Key Information:

Vendor

Symfony

Status
Symfony
Yaml
Vendor
CVE Published:
14 July 2026

What is CVE-2026-45305?

The Symfony framework presents a vulnerability in its Yaml component where the Parser::cleanup() method improperly utilizes overlapping quantifiers in regular expressions. This flaw can lead to prolonged parsing delays when processing specially crafted input. Versions prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12 are susceptible. It is essential for users to upgrade to these patched versions to ensure robust security against input manipulation risks.

Affected Version(s)

symfony < 5.4.52 < 5.4.52

symfony >= 6.0.0-BETA1, < 6.4.40 < 6.0.0-BETA1, 6.4.40

symfony >= 7.0.0-BETA1, < 7.4.12 < 7.0.0-BETA1, 7.4.12

References

https://github.com/symfony/symfony/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/symfony/symfony/commit/9749cd43c5e09b3...
x_refsource_MISC
https://github.com/symfony/symfony/releases/tag/v5.4.52
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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