CVE-2018-11386: An issue was discovered in the HttpFoundation component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11,...

Description

An issue was discovered in the HttpFoundation component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11. The PDOSessionHandler class allows storing sessions on a PDO connection. Under some configurations and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources.

Metrics

EPSS Probability

1.61%

72.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-613

Affected Software

Vendor	Product	Versions
Sensiolabs	Symfony	>= 2.7.0, < 2.7.48
Sensiolabs	Symfony	>= 2.8.0, < 2.8.41
Sensiolabs	Symfony	>= 3.3.0, < 3.3.17
Sensiolabs	Symfony	>= 3.4.0, < 3.4.11
Sensiolabs	Symfony	>= 4.0.0, < 4.0.11
Debian	Debian Linux	9.0

References

Timeline

Published: Jun 13, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-11386?

An issue was discovered in the HttpFoundation component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11. The PDOSessionHandler class allows storing sessions on a PDO connection. Under some configurations and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources.

How severe is CVE-2018-11386?

Severity scoring for CVE-2018-11386 is pending analysis. The EPSS model estimates a 1.61% probability of exploitation in the next 30 days.

How do I fix CVE-2018-11386?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.