---
title: "CVE-2019-13032\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-2019-13032?format=md
keywords: index, follow
---

# CVE-2019-13032

Publication date 28 June 2019

Last updated 25 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**5.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2019-13032?format=md#impact-score)

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## Description

An issue was discovered in FlightCrew v0.9.2 and earlier. A NULL pointer
dereference occurs in GetRelativePathToNcx() or
GetRelativePathsToXhtmlDocuments() when a NULL pointer is passed to
xc::XMLUri::isValidURI(). This affects third-party software (not Sigil)
that uses FlightCrew as a library.

### From the Ubuntu Security Team

Mike Salvatore discovered that FlightCrew improperly handled certain malformed
EPUB files. An attacker could potentially use this vulnerability to cause a
denial of service.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| flightcrew | 19.04 disco | Fixed 0.7.2+dfsg-13ubuntu0.19.04.1 |
| 18.10 cosmic | Fixed 0.7.2+dfsg-12ubuntu0.1 |
| 18.04 LTS bionic | Fixed 0.7.2+dfsg-10ubuntu0.1 |
| 16.04 LTS xenial | Fixed 0.7.2+dfsg-6ubuntu0.1 |
| 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**

5.5 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Local |
  | 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 | 5.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:L/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-2019-13032)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-13032)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-13032)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-13032)

### Related Ubuntu Security Notices (USN)

+ [USN-4055-1](https://usn.ubuntu.com/USN-4055-1)
+ flightcrew vulnerabilities
+ 15 July 2019

### Other references

* <https://github.com/Sigil-Ebook/flightcrew/issues/53>
* <https://salvatoresecurity.com/fun-with-fuzzers-or-how-i-discovered-three-vulnerabilities-part-1-of-3/>
* <https://www.cve.org/CVERecord?id=CVE-2019-13032>