---
title: "CVE-2019-11049\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-2019-11049?format=md
keywords: index, follow
---

# CVE-2019-11049

Publication date 23 December 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**9.8 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2019-11049?format=md#impact-score)

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## Description

In PHP versions 7.3.x below 7.3.13 and 7.4.0 on Windows, when supplying
custom headers to mail() function, due to mistake introduced in commit
78f4b4a2dcf92ddbccea1bb95f8390a18ac3342e, if the header is supplied in
lowercase, this can result in double-freeing certain memory locations.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-11049?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| php5 | 19.10 eoan | Not in release |
| 19.04 disco | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not affected |
| php7.0 | 19.10 eoan | Not in release |
| 19.04 disco | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| php7.2 | 19.10 eoan | Not in release |
| 19.04 disco | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| php7.3 | 19.10 eoan | Not affected |
| 19.04 disco | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 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)
* [Patch details](https://ubuntu.com/security/CVE-2019-11049?format=md#patch-details)

## Notes

---

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

this issue is Windows-specific

### 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 |
| --- | --- |
| php7.3 | * Upstream:   <http://git.php.net/?p=php-src.git;a=commit;h=11893c8e665d285f72c2b8a0fbe01a3fcc03b806> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.8 · Critical

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.8 · Critical |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11049)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-11049)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-11049)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-11049)

### Other references

* <http://git.php.net/?p=php-src.git;a=patch;h=11893c8e665d285f72c2b8a0fbe01a3fcc03b806>
* <https://www.cve.org/CVERecord?id=CVE-2019-11049>