---
title: "CVE-2018-11203\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-2018-11203?format=md
keywords: index, follow
---

# CVE-2018-11203

Publication date 16 May 2018

Last updated 27 February 2026

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2018-11203?format=md#impact-score)

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## Description

A division by zero was discovered in H5D\_\_btree\_decode\_key in H5Dbtree.c in
the HDF HDF5 1.10.2 library. It could allow a remote denial of service
attack.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| hdf5 | 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 |
| 18.04 LTS bionic | Vulnerable |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Vulnerable |

---

* [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-2018-11203?format=md#patch-details)

### 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 |
| --- | --- |
| hdf5 | * Upstream:   [c132cb5](https://github.com/HDFGroup/hdf5/commit/c132cb5565de02fd4e1e2cfe8ea7b89b21f785ac) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.5 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-11203)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-11203)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-11203)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-11203)

### Other references

* <https://jira.hdfgroup.org/browse/HDFFV-10477>
* <https://bitbucket.hdfgroup.org/projects/HDFFV/repos/hdf5/commits/d0362ce438aef8ad690d5b084d929403c9877107>
* <https://www.cve.org/CVERecord?id=CVE-2018-11203>