---
title: "CVE-2018-11386\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2018-11386?format=md
keywords: index, follow
---

# CVE-2018-11386

Publication date 13 June 2018

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2018-11386?format=md#impact-score)

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| symfony | 18.04 LTS bionic | Fixed 3.4.6+dfsg-1ubuntu0.1 |
| 17.10 artful | Ignored end of life |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.9 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.9 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-11386)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-11386)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-11386)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-11386)

### Other references

* <https://symfony.com/blog/cve-2018-11386-denial-of-service-when-using-pdosessionhandler>
* <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G4XNBMFW33H47O5TZGA7JYCVLDBCXAJV/>
* <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBQK7JDXIELADIPGZIOUCZKMAJM5LSBW/>
* <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WU5N2TZFNGXDGMXMPP7LZCWTFLENF6WH/>
* <https://www.cve.org/CVERecord?id=CVE-2018-11386>