---
title: "CVE-2016-9910\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-2016-9910?format=md
keywords: index, follow
---

# CVE-2016-9910

Publication date 22 February 2017

Last updated 26 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**6.1 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2016-9910?format=md#impact-score)

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## Description

The serializer in html5lib before 0.99999999 might allow remote attackers
to conduct cross-site scripting (XSS) attacks by leveraging mishandling of
special characters in attribute values, a different vulnerability than
CVE-2016-9909.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2016-9910?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| html5lib | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 17.10 artful | Not affected |
| 17.04 zesty | Not affected |
| 16.10 yakkety | Ignored end of life |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Ignored end of life |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2016-9910?format=md#patch-details)

## Notes

---

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

same commit as CVE-2016-9909
fix changes externally visible api from True|False boolean to
a ternary value, which will break users.

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| html5lib | * Other:   [9b8d8eb](https://github.com/html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.1 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.1 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9910)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-9910)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-9910)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-9910)

### Other references

* <https://www.sourceclear.com/registry/security/cross-site-scripting-xss-/python/sid-3068>
* <http://www.openwall.com/lists/oss-security/2016/12/06/5>
* <https://www.cve.org/CVERecord?id=CVE-2016-9910>