---
title: "CVE-2018-18226\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-2018-18226?format=md
keywords: index, follow
---

# CVE-2018-18226

Publication date 12 October 2018

Last updated 25 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2018-18226?format=md#impact-score)

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## Description

In Wireshark 2.6.0 to 2.6.3, the Steam IHS Discovery dissector could
consume system memory. This was addressed in
epan/dissectors/packet-steam-ihs-discovery.c by changing the
memory-management approach.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| wireshark | 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Fixed 2.6.4-2~ubuntu18.04.0 |
| 16.04 LTS xenial | Fixed 2.6.4-2~ubuntu16.04.0 |
| 14.04 LTS trusty | Fixed 2.6.4-2~ubuntu14.04.1 |

---

* [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**

7.5 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18226)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-18226)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-18226)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-18226)

### Other references

* <https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15171>
* <https://code.wireshark.org/review/gitweb?p=wireshark.git;a=commit;h=6e920ddc3cad2886ef07ca1a8e50e2a5c50986f7>
* <https://www.wireshark.org/security/wnpa-sec-2018-48.html>
* <https://www.cve.org/CVERecord?id=CVE-2018-18226>