---
title: "CVE-2015-8806\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-2015-8806?format=md
keywords: index, follow
---

# CVE-2015-8806

Publication date 13 April 2016

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-2015-8806?format=md#impact-score)

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## Description

dict.c in libxml2 allows remote attackers to cause a denial of service
(heap-based buffer over-read and application crash) via an unexpected
character immediately after the "<!DOCTYPE html" substring in a crafted
HTML document.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2015-8806?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libxml2 | 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Fixed 2.9.3+dfsg1-1ubuntu0.1 |
| 15.10 wily | Fixed 2.9.2+zdfsg1-4ubuntu0.4 |
| 14.04 LTS trusty | Fixed 2.9.1+dfsg1-3ubuntu4.8 |
| 12.04 LTS precise | Fixed 2.7.8.dfsg-5.1ubuntu4.15 |

---

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

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

This is a dupe of CVE-2016-1839

## 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:3.1/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-2015-8806)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-8806)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-8806)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-8806)

### Related Ubuntu Security Notices (USN)

+ [USN-2994-1](https://usn.ubuntu.com/USN-2994-1)
+ libxml2 vulnerabilities
+ 6 June 2016

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2015-8806>
