---
title: "CVE-2011-2692\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-2011-2692?format=md
keywords: index, follow
---

# CVE-2011-2692

Publication date 17 July 2011

Last updated 25 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**8.8 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2011-2692?format=md#impact-score)

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## Description

The png\_handle\_sCAL function in pngrutil.c in libpng 1.0.x before 1.0.55,
1.2.x before 1.2.45, 1.4.x before 1.4.8, and 1.5.x before 1.5.4 does not
properly handle invalid sCAL chunks, which allows remote attackers to cause
a denial of service (memory corruption and application crash) or possibly
have unspecified other impact via a crafted PNG image that triggers the
reading of uninitialized memory.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2011-2692?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| chromium-browser | 12.04 LTS precise | Not affected |
| 11.10 oneiric | Fixed 14.0.835.202~r103287-0ubuntu1 |
| 11.04 natty | Fixed 14.0.835.202~r103287-0ubuntu0.11.04.1 |
| 10.10 maverick | Fixed 14.0.835.202~r103287-0ubuntu0.10.10.1 |
| 10.04 LTS lucid | Fixed 14.0.835.202~r103287-0ubuntu0.10.04.2 |
| 8.04 LTS hardy | Not in release |
| firefox | 12.04 LTS precise | Fixed 8.0~b4+build1-0ubuntu2 |
| 11.10 oneiric | Fixed 8.0+build1-0ubuntu0.11.10.1 |
| 11.04 natty | Fixed 8.0+build1-0ubuntu0.11.04.1 |
| 10.10 maverick | Ignored end of life |
| 10.04 LTS lucid | Fixed 10.0+build1-0ubuntu0.10.04.2 |
| 8.04 LTS hardy | Ignored end of life |
| libpng | 12.04 LTS precise | Not affected |
| 11.10 oneiric | Not affected |
| 11.04 natty | Fixed 1.2.44-1ubuntu3.1 |
| 10.10 maverick | Fixed 1.2.44-1ubuntu0.1 |
| 10.04 LTS lucid | Fixed 1.2.42-1ubuntu2.2 |
| 8.04 LTS hardy | Fixed 1.2.15~beta5-3ubuntu0.4 |

---

* [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-2011-2692?format=md#patch-details)

## Notes

---

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

firefox 3.6.23 has 1.2.35 and 7.0.1 has 1.4.7

---

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

firefox 8 will have 1.4.8

### 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 |
| --- | --- |
| libpng | * Upstream:   <http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng/libpng;a=commit;h=61a2d8a2a7b03023e63eae9a3e64607aaaa6d339> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.8 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.8 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-2692)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2011-2692)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2011-2692)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2011-2692)

### Related Ubuntu Security Notices (USN)

+ [USN-1175-1](https://usn.ubuntu.com/USN-1175-1)
+ libpng vulnerabilities
+ 26 July 2011

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2011-2692>